Which protein inhibits the classical complement pathway at the very beginning of the pathway?

Name: Which protein inhibits the classical complement pathway at the very beginning of the pathway?
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Question

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C1INH inhibits the classical complement pathway at the very beginning of the pathway by binding to C1 and inactivating it, preventing it from initiating the cascade. C4BP, C3BP, and Factor H are regulatory proteins that act at later stages in the pathway.

Which Protein Inhibits the Classical Complement Pathway at the Very