Collagen yog lub tsev tseem ceeb tshaj plaws hauv lub cev thiab nws ua rau kwv yees li 30% ntawm cov proteins hauv peb lub cev. Collagen yog cov txheej txheem tseem ceeb ntawm cov protein uas ua kom cov cohesion, elasticity thiab rov tsim dua tshiab ntawm tag nrho peb cov ntaub so ntswg, nrog rau cov tawv nqaij, tendons, ligaments, pob txha mos thiab pob txha. Hauv cov ntsiab lus, collagen muaj zog thiab hloov tau thiab yog 'cov kua nplaum' uas tuav txhua yam ua ke. Nws ntxiv dag zog rau ntau yam qauv ntawm lub cev nrog rau kev ncaj ncees ntawm peb cov tawv nqaij. Muaj ntau ntau hom collagen hauv peb lub cev, tab sis 80 mus rau 90 feem pua ntawm lawv yog hom I, II lossis III, nrog rau feem ntau yog Hom I collagen. Hom I collagen fibrils muaj zog tensile zog. Qhov no txhais tau tias lawv tuaj yeem ncav cuag yam tsis tau tawg.