Specific for CA125 antigen from human ovarian carcinoma (epitope specificity group A (ISOBM classification) similar to OC125). Can be used for detection of CA125 antigen, recommended pairs for sandwich immunoassay (coating - conjugate): X306 - X52 (best pair), X306 - X325, X75 - X306, X52 - X306. HRP-conjugation for MAb X306 is not recommended; also works in WB