Cal bụ heterodimer, nke mejupụtara MRP 8 na MRP 14. Ọ dị na cytoplasm neutrophils ma gosipụta ya na membranes cell mononuclear.Cal bụ protein na-agba agba, ọ nwere usoro kwụsiri ike nke ọma ihe dị ka otu izu n'ime afọ mmadụ, e kpebisiri ike na ọ ga-abụ akara nrịanrịa na-afụ ụfụ.Ngwa ahụ bụ ule dị mfe, nke na-ahụ anya nke na-achọpụta cal n'ime afọ mmadụ, ọ nwere mmetụta nchọpụta dị elu yana nkọwa siri ike.Nnwale ahụ dabere na ụkpụrụ mmeghachi omume Sanwichi dị elu nke nwere mgbochi abụọ na teknụzụ nyocha nyocha nke ọla edo, ọ nwere ike inye nsonaazụ n'ime nkeji iri na ise.