Common use of ROYALTY PHARMA COLLECTION TRUST Clause in Contracts

ROYALTY PHARMA COLLECTION TRUST. By: Wilmington Trust Company, not in its individual capacity but solely in its capacity as owner trustee By /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Assistant Vice President PROPRIUS, INC. By /s/ Xxxxxx X. Xxxxx Name: Xxxxxx X. Xxxxx Title: Authorized Person EXAGEN DIAGNOSTICS, INC. By /s/ Xxx Xxxxx Name: Xxx Xxxxx Title: C.E.O. EXHIBIT A Form of Note SECURED PROMISSORY NOTE $2,000,000 October 8, 2012

ROYALTY PHARMA COLLECTION TRUST. By: Wilmington Trust Company, not in its individual capacity but solely in its capacity as owner trustee By By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxx Title: Assistant Vice President PROPRIUS, INC. By /s/ Xxxxxx X. Xxxxx Name: Xxxxxx X. Xxxxx Title: Authorized Person EXAGEN DIAGNOSTICS, INC. By By: /s/ Xxxxxxxxx Xxx Xxxxx Name: Xxxxxxxxx Xxx Xxxxx Rocca Title: C.E.O. EXHIBIT A Form of Note SECURED PROMISSORY NOTE $2,000,000 October 8, 2012President and Chief Executive Officer