Immunogen sequence: SGKSFKAGVC PPKKSAQCLR YKKPECQSDW QCPGKKRCCP DTCGIKCLDP VDTPNPTRRK PGKCPVTYGQ CLMLNPPNFC EMDGQCKRDL KCCMGMCGKS CV. SLPI is a secreted inhibitor which protects epithelial tissues from serine proteases. It is found in various secretions