Cal ndi heterodimer, yomwe imapangidwa ndi MRP 8 ndi MRP 14. Imapezeka mu neutrophils cytoplasm ndipo imawonetsedwa pamagulu a cell a mononuclear. Cal ndi pachimake gawo mapuloteni, ali bwino khola gawo pafupifupi sabata imodzi mu ndowe za anthu, izo anatsimikiza kukhala kutupa m`mimba chizindikiro. Chidachi ndi mayeso osavuta, owonera semiqualitative omwe amazindikira cal mu ndowe za anthu, amakhala ndi chidwi chodziwikiratu komanso mawonekedwe amphamvu. Mayeso otengera ma antibodies awiri a sandwich reaction mfundo ndi golide immunochromatographic assay technics, amatha kupereka zotsatira mkati mwa mphindi 15.