passages.id: split_1_test_2349_passage
passages.type: progene_text
passages.text: We have recently identified a gene ( the WFIKKN gene ) on human chromosome 16 ( 16p13.3 ) that encodes a secreted protein containing WAP - type , Follistatin / Kazal type , Kunitz - type and NTR - type protease - inhibitory modules and an Immunoglobulin domain [ Trexler et al. , Proc. Natl. Acad. Sci. USA 98 ( 2001 ) , 3705 - 3709 ] .