21. The cytoplasm is released and the protein keratin is inserted. 22. Eleidin is then converted to keratin in the stratum corneum. 23. Keratinases are produced only in the presence of keratin -containing substrate. 24. The serrations probably helped anchor an even larger keratin extension. 25. Scutes : The plates made of keratin on top of the upper shell. 26. Or, rather, keratin , the protein that hair is made of. 27. The baleen of baleen whales consists of long, fibrous strands of keratin . 28. Mysticetes have large whalebone, as opposed to teeth, made of keratin . 29. Furthermore, keratin expression is helpful in determining epithelial origin in anaplastic cancers. 30. Tumors that express keratin include carcinomas, thymomas, sarcomas and trophoblastic neoplasms.
