When bound to CR1,C3b is cleaved by _____,generating pathogen-associated B-cell co-receptor ligands.

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When C3b binds to CR1, it becomes susceptible to cleavage by the serine protease factor I, leading to the formation of iC3b and C3f fragments. These fragments can then bind to B-cell co-receptors and promote antigen presentation, ultimately leading to an adaptive immune response against the pathogen. Choices B, C, D, and E are not involved in this process.

When Bound to CR1,C3b Is Cleaved by _____,Generating Pathogen-Associated B-Cell