Cal ni heterodimer, igizwe na MRP 8 na MRP 14. Iba muri neutrophile cytoplasm kandi ikagaragarira kuri selile monon nuclear. Cal ni poroteyine ikaze, ifite icyiciro gihamye hafi icyumweru kimwe mumyanda yabantu, yiyemeje kuba ikimenyetso cyindwara yumura. Igikoresho ni ikizamini cyoroshye, cyerekanwa semiqualitative igaragaza inyana mumyanda yabantu, ifite sensibilité yo hejuru kandi yihariye. Ikizamini gishingiye ku buryo bwihariye bwihariye antibodies sandwich reaction ihame hamwe na zahabu immunochromatographic assay tekinike yo gusesengura, irashobora gutanga ibisubizo muminota 15.