He heterodimer ka Cal, i haku ʻia me MRP 8 a me MRP 14. Aia i loko o ka neutrophils cytoplasm a hōʻike ʻia ma nā membrane cell mononuclear. ʻO Cal he mau proteins acute phase, loaʻa iā ia kahi pae paʻa e pili ana i hoʻokahi pule i loko o nā faeces kanaka, ua hoʻoholo ʻia he hōʻailona maʻi ʻeha. He ho'āʻo semiqualitative maʻalahi ke kit e ʻike i ka cal i loko o nā faeces kanaka, he kiʻekiʻe ka ʻike ʻike a me ka kikoʻī ikaika. ʻO ka hoʻāʻo e pili ana i ke ʻano kiʻekiʻe specificit double antibodies sandwich reaction principle a me ke gula immunochromatographic assay analysis technics, hiki iā ia ke hāʻawi i kahi hopena i loko o 15 mau minuke.