Kalmar "extracellular" tana nufin sararin samaniya a wajen kwayoyin halitta a cikin kwayoyin halitta ko tsarin. Ana iya amfani da shi don bayyana abubuwa ko matakai da ke faruwa a waje da membrane na tantanin halitta. Misali, ruwa na waje yana nufin ruwan da ke kewaye da kuma wanke sel, yayin da matrix extracellular yana nufin hanyar sadarwa na kwayoyin halitta da ke tallafawa da haɗa sel a cikin kyallen takarda.