Keratins are also found in the gastrointestinal tracts of many animals, including roundworms (who also have an outer layer made of keratin).
k ɛ ɹ ʌ t ɪ n z WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY ɔ l s oʊ WORD_BOUNDARY f aʊ n d WORD_BOUNDARY ɪ n ð ə WORD_BOUNDARY ɡ æ s t ɹ oʊ ɪ n t ɛ s t ɪ n ə l WORD_BOUNDARY t ɹ æ k t s WORD_BOUNDARY ʌ v WORD_BOUNDARY m ɛ n i WORD_BOUNDARY æ n ɪ m ə l z WORD_BOUNDARY ɪ ŋ k l uː d ɪ ŋ WORD_BOUNDARY ɹ aʊ n d w ɜː m z WORD_BOUNDARY h uː WORD_BOUNDARY ɔ l s oʊ WORD_BOUNDARY h æ v WORD_BOUNDARY ʌ n WORD_BOUNDARY aʊ t ə ɹ WORD_BOUNDARY l eɪ ə ɹ WORD_BOUNDARY m eɪ d WORD_BOUNDARY ʌ v WORD_BOUNDARY k ɛ ɹ ʌ t ɪ n WORD_BOUNDARY