“…Mucin-like FCGBPs are well conserved in vertebrates including humans ( 25 , 39 ). The protein is widely expressed on mucosal surfaces and in external secretions with unknown physiological functions ( 34 , 40 , 41 , 42 ). Because of the lack of anti-FCGBP antibodies, we purified the homemade anti-FCGBP antibodies for functional experiments ( Fig.…”