Exhibit 4.26



ASSIGNMENT
AND ASSUMPTION AGREEMENT



Assignment
And Assumption Agreement (the “Assignment”),
made as of May  __, 2018, between cCAM Biotherapeutics Limited
(“Assignor”) and Famewave Ltd. (“Assignee”) and agreed
to by Tel Hashomer - Medical Research, Infrastructure and Services Ltd.(“Tel
Hashomer”) and Ramot at Tel Aviv University Ltd. (“Ramot”
and together with Tel Hashomner, “Licensor”).



W
I T N E S S E T H :



Whereas,
Assignor is a party to a certain Restated and Amended License Agreement dated April 16, 2012, as amended (the “Agreement”),
by and among Licensor and Assignor; and



Whereas,
Assignee has acquired from Assignor certain assets developed subject to the Agreement; and



Whereas,Assignor and Assignee desire that Assignor assign all of Assignor’s
rights, title and interest in, to and under the Agreement to Assignee, and that Assignee assume all of Assignor’s obligations
and duties under the Agreement; and



Whereas,Licensor is willing to consent to such assignment and assumption
on the terms and subject to the conditions set forth herein;



Now,
Therefore, in consideration of the mutual
covenants and conditions hereinafter set forth, the parties hereto agree as follows:



ARTICLE
I

ASSIGNMENT
OF RIGHTS; ASSUMPTION OF OBLIGATIONS



Section
1.1. Assignor hereby acknowledges that it has assigned to Assignee all of its rights, title and interest under the Agreement
and Assignee has accepted such assignment.



Section
1.2. Assignee hereby assumes and agrees to undertake and perform any and all obligations and duties of Assignor under the
Agreement.



ARTICLE
II

LICENSOR’S
CONSENT



Section
2.1. Licensor hereby consents and agrees to the assignment and assumption set forth in Article I hereof.













ARTICLE
III

MISCELLANEOUS



Section
3.1. Counterparts. This Assignment may be executed in multiple copies, each of which shall for all purposes bind the
parties, and each party hereby covenants and agrees to execute all duplicates or replacement counterparts of this Assignment as
may be required.



Section
3.2. Applicable Law. This Assignment shall be governed by and construed in accordance with the laws of the State of
New York, without giving effect to the conflicts of laws provisions thereof.



In
Witness Whereof, the parties have caused
this Assignment to be executed by their authorized officers as of the date first written above.



|cCAM
    Biotherapeutics Limited                                      |        | Famewave
    Ltd.                    
|--------------------------------------------------------------------- | ------ | -------------------------------------
|                                                                      |        |                                      
|By:                                                                   |        |                                      
|                                                                      | Name:  |                                      
|                                                                      | Title: |                                      
|                                                                      |        |                                      
|Tel
    Hashomer - Medical Research, Infrastructure and Services Ltd. |        | Ramot
    at Tel Aviv University Ltd.
|                                                                      |        |                                      
|By:                                                                   |        |                                      
|                                                                      | Name:  |                                      
|                                                                      | Title: |