简介：Collagenisthemajoracellcarofconnectivetissueproteininanimals,accountingforabout25%ofthetotalbodyproteinofvertebrates.Anessentialfeatureofthistypeofbiomaterialisthatitdegradesinbiologicenvironments,eventuallydisap-pears,andleavesnopermanentforeignresidue.Averypracticalaspectoftheuseofcollagenisitseaseofpreparationanditswidespreadoccurrenceinnature.Thus,col-lagenhasbeenemployedasabiomaterialinalmosteveryphysicalform.Forexam-ple,collagenfibrescanbeusedasasubstratefornerveregeneration,tendonligament
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