C4A and alkaline phosphatase measurement: In bacteriostatic AP, the levels of the immunoglobulin variable heavy-chain protein (IGHV, A0A060Y462), uncharacterised C-type lectin (A0A060W1N4), complement component C4 (A0A060YQU6), and coagulation factor XIII B (A0A060YM30, complement factor H family) were significantly higher than those in NP, suggesting the activation of the complement system.