Blood Proteoform Atlas (IMAGE) Northwestern University Caption The Blood Proteoform Atlas (BPA) compiles ~56,000 proteoforms identified from 21 human cells types and plasma Credit Please credit Kelleher and Levitsky labs at Northwestern University Usage Restrictions No restrictions License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.