Immunogen sequence: ELLRQQVREI TFLKNTVMEC DACGMQQSVR TGLPSVRPLL HCAPGFCFPG VACIQTESGA RCGPCPAGFT GNGSHCTDVN ECNAHPCFPR VRCINTSPGF R. COMP is a noncollagenous extracellular matrix protein. It consists of five identical glycoprotein subunits, each with EGF