Cal wani nau'in heterodimer ne, wanda ya ƙunshi MRP 8 da MRP 14. Yana wanzuwa a cikin ƙwayoyin neutrophils cytoplasm kuma yana bayyana a kan membranes na ƙwayoyin mononuclear. Cal furotin ne mai saurin kamuwa da cuta, yana da tsari mai kyau na kimanin mako guda a cikin najasar ɗan adam, an tabbatar da cewa alama ce ta cututtukan hanji mai kumburi. Kayan aikin gwaji ne mai sauƙi, na gani wanda ke gano cal a cikin najasar ɗan adam, yana da babban ƙarfin ganowa da kuma takamaiman takamaiman aiki. Gwajin da aka yi bisa ƙa'idar amsawar sandwich ta rigakafi mai ƙarfi da fasahar nazarin gwajin immunochromatographic ta zinariya, yana iya bayar da sakamako cikin mintuna 15.