Document:

EXHIBIT 4.1

NUMBER                      [ANDRX CORPORATION LOGO]                      SHARES
ACA

COMMON STOCK            ANDRX CORPORATION - ANDRX GROUP             COMMON STOCK
          INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE CUSIP 034553 10 7

THIS IS TO CERTIFY THAT

is the owner of

FULLY PAID AND NON-ASSESSABLE SHARES OF THE ANDRX CORPORATION--ANDRX GROUP
COMMON STOCK, PAR VALUE $.001 PER SHARE, OF
                               ANDRX CORPORATION
transferable on the books of the Corporation by the holder hereof in person or
by duly authorized attorney, upon surrender of this certificate properly
endorsed.
         This certificate is not valid until countersigned and registered by the
Transfer Agent and Registar.
         Witness the facsimile seal of the Corporation and the facsimile
signatures of its duly authorized officers.
                                       Dated:

/s/ ALAN P. COHEN                  ANDRX CORPORATION             /s/ SCOTT LODIN
CO-CHAIRMAN OF THE BOARD            CORPORATE SEAL               SECRETARY
                                         2000
                                       DELAWARE

COUNTERSIGNED AND REGISTERED:
           AMERICAN STOCK TRANSFER & TRUST COMPANY
                     (NEW YORK, N.Y.)                             TRANSFER AGENT
BY                                                                 AND REGISTRAR

                                                            AUTHORIZED SIGNATURE

<PAGE>

                               ANDRX CORPORATION

         The following abbreviations, when used in the inscription on the face
of this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations.

TEN COM - as tenants in common          UNIF GIFT MIN ACT--......Custodian......
                                                           (Cust)        (Minor)
TEN ENT - as tenants by the entireties                     under Uniform Gifts
                                                           to Minors Act........
JT TEN  - as joint tenants with right                                    (State)
          of survivorship and not as
          tenants in common

    Additional abbreviations may also be used though not in the above list.

For value received, ______________________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
    IDENTIFYING NUMBER OF ASSIGNEE
_____________________________________
|                                    |
|____________________________________|__________________________________________

________________________________________________________________________________
 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)
________________________________________________________________________________

________________________________________________________________________________

_________________________________________________________________________ shares
of the Andrx Corporation--Andrx Group Common Stock represented by the within
Certificate, and do hereby irrevocably constitute and appoint __________________
Attorney to transfer the said stock on the books of the within named
Corporation with full power of substitution in the premises.

Dated _________________________

                               _________________________________________________
                       NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND
                               WITH THE NAME AS WRITTEN UPON THE FACE OF THE
                               CERTIFICATE IN EVERY PARTICULAR, WITHOUT
                               ALTERATION OR ENLARGMENT OR ANY CHANGE WHATEVER.

Signature(s) Guaranteed:

____________________________________________
THE SIGNATURE(S) MUST BE GUARANTEED BY AN
ELIGIBLE GUARANTOR INSTITUTION (BANKS,
STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS
AND CREDIT UNIONS WITH MEMBERSHIP IN AN
APPROVED SIGNATURE GUARANTEE MEDALLION
PROGRAM, PUSUANT TO S.E.C. RULE 17Ad-15.EXHIBIT 4.2

NUMBER                      [ANDRX CORPORATION LOGO]                      SHARES
ACC

COMMON STOCK            ANDRX CORPORATION - CYBEAR GROUP            COMMON STOCK
          INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE CUSIP 034553 20 6

THIS IS TO CERTIFY THAT

is the owner of

FULLY PAID AND NON-ASSESSABLE SHARES OF THE ANDRX CORPORATION--CYBEAR GROUP
COMMON STOCK, PAR VALUE $.001 PER SHARE, OF
                               ANDRX CORPORATION
transferable on the books of the Corporation by the holder hereof in person or
by duly authorized attorney, upon surrender of this certificate properly
endorsed.
         This certificate is not valid until countersigned and registered by the
Transfer Agent and Registar.
         Witness the facsimile seal of the Corporation and the facsimile
signatures of its duly authorized officers.
                                       Dated:

/s/ ALAN P. COHEN                  ANDRX CORPORATION             /s/ SCOTT LODIN
CO-CHAIRMAN OF THE BOARD            CORPORATE SEAL               SECRETARY
                                         2000
                                       DELAWARE

COUNTERSIGNED AND REGISTERED:
           AMERICAN STOCK TRANSFER & TRUST COMPANY
                     (NEW YORK, N.Y.)                             TRANSFER AGENT
BY                                                                 AND REGISTRAR

                                                            AUTHORIZED SIGNATURE

<PAGE>

                               ANDRX CORPORATION

         The following abbreviations, when used in the inscription on the face
of this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations.

TEN COM - as tenants in common          UNIF GIFT MIN ACT--......Custodian......
                                                           (Cust)        (Minor)
TEN ENT - as tenants by the entireties                     under Uniform Gifts
                                                           to Minors Act........
JT TEN  - as joint tenants with right                                    (State)
          of survivorship and not as
          tenants in common

    Additional abbreviations may also be used though not in the above list.

For value received, ______________________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
    IDENTIFYING NUMBER OF ASSIGNEE
_____________________________________
|                                    |
|____________________________________|__________________________________________

________________________________________________________________________________
 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)
________________________________________________________________________________

________________________________________________________________________________

_________________________________________________________________________ shares
of the Andrx Corporation--Cybear Group Common Stock represented by the within
Certificate, and do hereby irrevocably constitute and appoint __________________
Attorney to transfer the said stock on the books of the within named
Corporation with full power of substitution in the premises.

Dated _________________________

                               _________________________________________________
                       NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND
                               WITH THE NAME AS WRITTEN UPON THE FACE OF THE
                               CERTIFICATE IN EVERY PARTICULAR, WITHOUT
                               ALTERATION OR ENLARGMENT OR ANY CHANGE WHATEVER.

Signature(s) Guaranteed:

____________________________________________
THE SIGNATURE(S) MUST BE GUARANTEED BY AN
ELIGIBLE GUARANTOR INSTITUTION (BANKS,
STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS
AND CREDIT UNIONS WITH MEMBERSHIP IN AN
APPROVED SIGNATURE GUARANTEE MEDALLION
PROGRAM, PUSUANT TO S.E.C. RULE 17Ad-15.EXHIBIT 4.2

                       FIRST AMENDMENT TO RIGHTS AGREEMENT

         THIS AMENDMENT  (this  "Amendment"),  dated as of September 5, 2000, to
the Rights Agreement,  dated as of January 1, 1996 (the "Rights Agreement"),  is
made by and between  Engineering  Animation,  Inc., a Delaware  corporation (the
"Company"),  and First  Chicago  Trust Company of New York, as Rights Agent (the
"Rights Agent").

                                    RECITALS

     A. The Company and the Rights  Agent have  heretofore  executed and entered
into the Rights Agreement.

     B.  Pursuant  to Section 27 of the Rights  Agreement,  the Company may from
time to time  supplement or amend the Rights  Agreement in  accordance  with the
provisions of Section 27 thereof.

     C. The  Company  proposes  to enter into an  Agreement  and Plan of Merger,
dated as of September 5, 2000 (as it may be further amended or supplemented from
time  to  time,  the  "Merger  Agreement")  among  Unigraphics   Solutions  Inc.
("Parent"),  UGS Acquisition  Corporation,  a Delaware  corporation and a wholly
owned  subsidiary of Parent  ("Purchaser"),  and the Company,  with respect to a
business  combination of the Company and Parent (the  "Merger"),  a Stockholders
Agreement  dated  as of  September  5,  2000  (as  may  be  further  amended  or
supplemented  from time to time,  the  "Stockholders  Agreement")  among Parent,
Purchaser,  and the  stockholders  named therein,  and a Stock Option  Agreement
dated September 5, 2000 (as it may be further amended or supplemented  from time
to time, the "Stock Option Agreement") among Parent and the Company.

     D. The Merger Agreement contemplates that the Company will amend the Rights
Agreement to the extent  necessary to provide that the  approval,  execution and
delivery  of the Merger  Agreement,  the  Stockholders  Agreement  and the Stock
Option Agreement and the consummation of the transactions  contemplated thereby,
including  without  limitation,  the exercise of the stock option,  will not (i)
cause Parent or any of its  subsidiaries  to become an Acquiring  Person or (ii)
cause  the  occurrence  of a Shares  Acquisition  Date or  Distribution  Date or
otherwise cause such Rights to separate from the underlying Common Stock or give
such holders the right to acquire securities of any party thereto.

     E. The Board of Directors has determined that it is in the best interest of
the Company and its  shareholders  to amend the Rights  Agreement  to exempt the
Merger  and  the  Merger  Agreement,  and all of the  transactions  contemplated
thereby, from the application of the Rights Agreement.

                                    AGREEMENT

NOW, THEREFORE, the Rights Agreement is hereby amended as follows:

         1. Section 1(a) of the Rights  Agreement is hereby  modified and
amended by adding the  following  proviso at the end of the first sentence
thereof:

         ";  provided  that  neither  Unigraphics  Solutions  Inc.,  a  Delaware
         corporation  ("UG"),  nor any of its Subsidiaries shall be deemed to be
         an Acquiring Person by virtue of the approval, execution or delivery of
         the  Agreement and Plan of Merger dated as of September 5, 2000, as may
         be amended from time to time, among UG, UGS Acquisition Corporation,  a
         Delaware  corporation  and a wholly  owned  subsidiary  of UG,  and the
         Company (the "UG Merger Agreement"), the Stockholders Agreement and the
         Stock  Option   Agreement  or  the  consummation  of  the  transactions
         contemplated thereby,  including,  without limitation,  the exercise of
         the stock option."

         2. Section 2 of the Rights  Agreement  is hereby  modified  and
amended by adding the  following  at the end of the last sentence thereof:

         "upon not less than ten (10) Business Days' notice to the Rights Agent.
         The Rights Agent shall have no duty to supervise such  co-Rights  Agent
         and in no  event  shall  the  Rights  Agent be  liable  for the acts or
         omissions of any co-Rights Agent."

         3. The Rights  Agreement is hereby further  modified and amended by
deleting Section 20(c) in its entirety and replacing it with the following:

         "The  Rights  Agent  shall be liable  hereunder  to the Company and any
         other  Person only for its own gross  negligence,  bad faith or willful
         misconduct."

The Rights  Agreement  is hereby  further  modified  and amended by adding a new
Section 34 to the end thereof to read in its entirety as follows:

                  "Section 34.  Merger  Agreement,  Stockholders  Agreement  and
         Stock Option Agreement with Unigraphics Solutions Inc.  Notwithstanding
         any other provision of this Agreement,  neither the approval, execution
         or delivery of the UG Merger Agreement,  the Stockholders  Agreement or
         the Stock Option  Agreement nor the  consummation  of the  transactions
         contemplated thereby, including without limitation, the exercise of the
         stock option,  is or shall be deemed to be a Section 11(a)(ii) Event or
         Section 13 Event, nor will such  performance or consummation  result in
         the occurrence of a Shares Acquisition Date, a Distribution Date or any
         other separation of the Rights from the underlying  Common Shares,  nor
         entitle or permit the holders of the Rights to  exercise  the Rights or
         otherwise affect the rights of the holders of Rights,  including giving
         the holders of the Rights the right to acquire  securities of any party
         to the UG Merger Agreement."

         4. This Amendment  shall be deemed to be a contract made under the laws
of the State of Delaware and for all purposes shall be governed by and construed
in accordance with the laws of such State applicable to contracts to be made and
performed entirely within such State.

         5. This Amendment may be executed in any number of  counterparts,  each
of which shall be an original,  but such counterparts shall together  constitute
one and the same instrument.

         6. Terms not defined herein shall,  unless the context otherwise
requires,  have the meanings assigned to such terms in the Rights Agreement.

         7. In all respects not  inconsistent  with the terms and  provisions of
this Amendment, the Rights Agreement is hereby ratified,  adopted,  approved and
confirmed. In executing and delivering this Amendment, the Rights Agent shall be
entitled to all the privileges and immunities afforded to the Rights Agent under
the terms and conditions of the Rights Agreement.

          [The remainder of this page has been intentionally left blank]

<PAGE>

         IN  WITNESS  WHEREOF,  this  Amendment  has been duly  executed  by the
Company and the Rights Agent as of the day and year first written above.

ATTEST:                           ENGINEERING ANIMATION, INC.

By: /s/  Jamie A. Wade      By:  /s/  Matthew M. Rizai
-----------------------          -------------------------------
Name:    Jamie A. Wade           Name:  Matthew M. Rizai
Title:  Secretary                Title:  Chairman & CEO

ATTEST:                          FIRST CHICAGO TRUST COMPANY
                                    OF NEW YORK

By:                         By:  /s/  Peter Sablich
     -----------------           -------------------------------
Name:                            Name:  Peter Sablich
Title:                           Title:  Managing Director

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