Table 2.

Humoral protein synthesis by the hepatic cecum during the acute phase response in amphioxus

Proteins	Examples	Immune function
Complement proteins	C1q, Bf/C2 and C3	Induce bacterial cell lysis, and enhance phagocytosis
Lectins	C-type lectins, ficolins, intelectins and apextrin 1	Agglutinate bacteria, and active complement
Antimicrobial proteins	PGRP, lysozymes, chitotriosidase, defensin, apolipoprotein A-I, alanine aminotransaminase, fibrinogen-related protein, AMPs, etc.	Kill or inhibit the growth of microbes
Iron-binding proteins	Ferritin and transferrin	Act to reduce free iron in the humoral fluid, and antimicrobial functions
Inflammatory modulators	TGF-β and BjIM1	Anti-inflammatory functions