Dalla Valle L; Nardi A; Belvedere P; Toni M; Alibardi L (2007). »Beta-keratins of differentiating epidermis of snake comprise glycine-proline-serine-rich proteins with an avian-like gene organization«. Dev. Dyn. 236 (7): 1939–1953. doi:10.1002/dvdy.21202. PMID17576619.
Dalla Valle L; Nardi A; Toffolo V; Niero C; Toni M; Alibardi L (2007). »Cloning and characterization of scale beta-keratins in the differentiating epidermis of geckoes show they are glycine-proline-serine-rich proteins with a central motif homologous to avian beta-keratins«. Dev. Dyn. 236 (2): 374–388. doi:10.1002/dvdy.21022. PMID17191254.
hindawi.com
Cortez Lopes F. Production of Proteolytic Enzymes by a Keratin-Degrading Aspergillus niger. Enzyme Research Volume 2011 (2011), članek ID 487093, doi:10.4061/2011/487093. Dostopno na: http://www.hindawi.com/journals/er/2011/487093/.
nih.gov
pubmed.ncbi.nlm.nih.gov
Dalla Valle L; Nardi A; Belvedere P; Toni M; Alibardi L (2007). »Beta-keratins of differentiating epidermis of snake comprise glycine-proline-serine-rich proteins with an avian-like gene organization«. Dev. Dyn. 236 (7): 1939–1953. doi:10.1002/dvdy.21202. PMID17576619.
Dalla Valle L; Nardi A; Toffolo V; Niero C; Toni M; Alibardi L (2007). »Cloning and characterization of scale beta-keratins in the differentiating epidermis of geckoes show they are glycine-proline-serine-rich proteins with a central motif homologous to avian beta-keratins«. Dev. Dyn. 236 (2): 374–388. doi:10.1002/dvdy.21022. PMID17191254.