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We have sequenced the chicken interleukin-1beta-converting enzyme (ICE) and ced-3 homolog (Ich-1) cDNA, and evaluated Ich-1 mRNA expression in the hen ovary during follicle development. While two alternatively spliced forms of Ich-1, Ich-1L and Ich-1S, were amplified by PCR from an embryonic chicken cDNA library, only the Ich-1L form was found to be expressed in adult ovarian granulosa and theca tissues. The deduced amino acid (aa) sequence of ICH-1L is 70.8% identical to human ICH-1L and contains the conserved QACRG peptide active catalytic sequence characteristic of many ICE-related family of cysteine proteases.
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Johnson et al. (1997) studied this question.
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