EX-10.11



 Exhibit 10.11 

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE EXAGEN INC. HAS DETERMINED THE
INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO EXAGEN INC. IF PUBLICLY DISCLOSED. 
 AMENDMENT NO. ONE TO

 ASSET PURCHASE AGREEMENT 

between: 
 CYPRESS BIOSCIENCE,
INC., 
 PROPRIUS, INC., 
 and

 EXAGEN DIAGNOSTICS 
 Dated as
of March 10, 2011 







 AMENDMENT NO. ONE TO ASSET PURCHASE AGREEMENT 

This Amendment No. One is made as of this 10th day of March, 2011 by and among Cypress Bioscience, Inc., a Delaware corporation
(“Seller”), Proprius, Inc., a Delaware corporation (“Subsidiary”), and Exagen Diagnostics, Inc., a Delaware corporation (“Purchaser” and, collectively with Seller and Subsidiary, the “Parties”) to that certain
Asset Purchase Agreement, dated as of October 8, 2010, by and among the Parties (the “Agreement”). Capitalized terms used but not defined herein shall have the respective meanings given to such terms in the Agreement. 

RECITAL 
 The Parties wish to set
forth herein amendments to certain provisions of the Agreement pertaining to the Acquired Xifin Accounts Receivable to, among other things, (a) change the amount Seller or Subsidiary is required to pay to Purchaser for the Acquired Xifin
Accounts Receivable, including for royalties and collection fees paid by Purchaser, and (b) provide that Purchaser need not collect receivables from patients except to the extent such patients have received reimbursement from insurance
companies. 
 AMENDMENT 
 The
Parties, intending to be legally bound, agree as follows: 
 1. Amendment and Restatement of Section 1.3(h). Section 1.3(h) of the
Agreement is amended and restated to read as follows: 
 “(h) Within [***] days after the delivery of each monthly
reconciliation contemplated by Section 1.8(f) of this Agreement, Seller or Subsidiary, as applicable, shall, subject to Section 10.17, pay to Purchaser: (i) for monthly reports within the period of time beginning on the Closing Date
and ending on January 31, 2011, an amount equal to (x) [***]% multiplied by all amounts received pursuant to Acquired Xifin Accounts Receivable during such month plus (y) [***]% multiplied by the amount of license royalties
paid by Purchaser under any Contracts which are attributable to such accounts receivable during such month plus (z) [***]% multiplied by the amount of the collection fee (which amount shall not exceed [***]% of the amount collected) paid
by Purchaser to Xifin with respect to such accounts receivable during such month, and (ii) for monthly reports within the period of time beginning on February 1, 2011 and continuing until the end of the Acquired Xifin Accounts Term, an
amount equal to (x) [***]% multiplied by all amounts received pursuant to Acquired Xifin Accounts Receivable during such month plus (y) [***]% multiplied by the amount of license royalties paid by Purchaser under any Contracts which
are attributable to such accounts receivable during such 

  

	***	 Certain Confidential Information Omitted 




  
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month plus (z) [***]% multiplied by the amount of the collection fee (which amount shall not exceed [***]% of the amount collected) paid by Purchaser to Xifin with respect to such
accounts receivable during such month. For accounts receivable for testing services performed by Purchaser with a date of service of October 6, 2010 or later (as defined by the blood sample draw date) (the “Post-10/5 Accounts
Receivable”), the Parties shall, subject to Section 10.17, follow the procedures set forth under “Post-10/5 Accounts Receivable” in Schedule 5.8.” 

2. Amendment to Section 1.7. Section 1.7 of the Agreement is amended by appending subsection (b) thereto, to read as follows: 

“(b) Notwithstanding anything to the contrary in Section 1.7(a)(iii), Purchaser shall have no obligation to make any efforts to collect
any patient receivables that are (i) [***] or (ii) [***]. For all collection efforts, Purchaser will have the right to use its patient financial assistance program and its reasonable billing and collection policies.” 

3. Treatment of Non-Xifin AR. The portion of Schedule 5.8 of the Agreement under the heading “Non-Xifin Accounts Receivable” is amended and
restated to read as follows: 
 “Non-Xifin Accounts Receivable (“Non-Xifin AR”) 

Claims or Payments for testing Services performed by Seller or Subsidiary, as applicable, with a date of service, as defined by blood sample
draw date, prior to January 12, 2010. 
  

	 	•	 	 Seller will retain all rights to pursue payment for Non-Xifin AR claims. 



 

	 	•	 	 Seller will not pursue payment for Non-Xifin AR resulting from amounts billed to patients if Seller or its agents
have not received such Claims or Payments on or before March 10, 2011; provided, however, the foregoing restriction shall not apply to any Reimbursement Receivables. 



  

	***	 Certain Confidential Information Omitted 




  
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	 	•	 	 Purchaser will make available any information and data required to pursue Non-Xifin AR.”



 4. Treatment of Xifin AR. The portion of Schedule 5.8 of the Agreement under the heading “Xifin Accounts Receivable”
is amended and restated to read as follows: 
 “Xifin Accounts Receivable (“Xifin AR”) 

Claims and Payments for testing services performed by Seller with a date of service, as defined by the blood sample draw date, of
January 12, 2010 through the close of business on October 5, 2010: 
  

	 	•	 	 All Xifin AR will be submitted for payment using Seller provider identification numbers. 



 

	 	•	 	 Purchaser will work with Xifin to provide all required information for efficient processing of Xifin AR.



  

	 	•	 	 Seller will provide purchaser with electronic copies of all deposits made to Seller for Xifin AR.



  

	 	•	 	 On a monthly basis Purchaser will provide Seller with a reconciliation statement detailing the total collections
by test for that month, the royalties owed on said payments, the collection fee owed to Xifin on said payments (per the surviving contract between Purchaser and Xifin, never to exceed [***]%), the [***]% to [***]% or [***]% to [***]% split, as
applicable to such month, between Seller and Purchaser of said payments and other payments owed between Seller and Purchaser relating to the royalties and payments to Xifin. 



 

	 	•	 	 Seller and Purchaser will settle the monies due within 14 days after the delivery of each monthly reconciliation
statement contemplated in the previous bullet point.” 


 5. Miscellaneous. Except as expressly amended hereby, the Agreement
shall remain in full force and effect in accordance with the terms thereof. This Amendment No. One will be construed in accordance with, and governed in all respects by, the laws of the State of California (without giving effect to principles of
conflicts of law) and may be executed in several counterparts, each of which will constitute an original and all of which, when taken together, will constitute one agreement. 

[Signatures Follow] 

  

	***	 Certain Confidential Information Omitted 




  
 3 








 The Parties have caused this Amendment No. One to be executed as of the date first written above.

  

									
	CYPRESS BIOSCIENCE, INC.	 		 	PROPRIUS, INC.
					
	By	 	 /s/ Jeffrey A. Meckler
	 		 	By	 	 /s/ Sabrina Martucci Johnson

	Name:	 	Jeffrey A. Meckler	 		 	Name:	 	Sabrina Martucci Johnson
	Title:	 	Interim Chief Executive Officer	 		 	Title:	 	President
				
	EXAGEN DIAGNOSTICS, INC.	 		 		 	
					
	By	 	 /s/ Scott L. Glenn
	 		 		 	
	Name:	 	Scott L. Glenn	 		 		 	
	Title:	 	Chairman and Chief Executive Officer	 		 		 	


  
 [Signature page to
Amendment No. One]