For each of the functions described in questions , select the complement system protein (A-F) that best matches it.
-Generated by factor I-mediated proteolysis, this complement fragment binds to complement receptor 2 (CR2) on B cells and enhances B cell activation.
A)C3b
B)iC3b
C)C3d
D)C5b
E)C5a

Question

Quizplus · Accepted Answer

C3d is covalently bound to cell surface and is produced by sequential factor I-mediated proteolytic processing of C3
It binds to CR2 on B cells simultaneously with antigen binding to membrane Ig
CR2 is part of a coreceptor complex, which also includes CD19 and CD21
CD19 transduces signals that synergize with the B cell receptor complex signals to activate the B cell.

For Each of the Functions Described in Questions , Select