Specific for CA125 antigen from human ovarian carcinoma (epitope specificity group B (ISOBM classification) similar to M-11). Can be used for detection of CA125 antigen, recommended pairs for sandwich immunoassay (coating - conjugate): X325 - X 52, X306 - X325. HRP-conjugation for MAb X306 is not recommended; also works in WB and in immunohistochemistry on paraffin embedded tissue.