Cal yog Heterodimer, uas yog muaj ntawm MRP 8 thiab mrp 14. Nws muaj nyob rau hauv neutrophils cyonuclear cell wee. Cal yog mob theem protein, nws muaj ib qho kev ua tau zoo ncua ntev li ib lub lim tiam hauv tib neeg faeces, nws yog txiav txim siab ua tus kab mob bucker. Cov khoom siv yog qhov yooj yim, kev kuaj pom kev pom tseeb, kuaj pom Cal nyob rau hauv tib neeg faeces, nws muaj kev kuaj pom siab thiab muaj zog tshwj xeeb. Qhov kev xeem raws li cov tshuaj tiv thaiv sandwich thiab kub immunomatogromogratogromogratogromogromographic thev naus laus zis, nws tuaj yeem muab rau hauv 15 feeb.