tokens: Cystatin A , a cysteine proteinase inhibitor , is one of the precursor proteins of cornified cell envelope of keratinocytes and is expressed during the late stage of keratinocyte differentiation .
folded_tokens: cystatin a , a cysteine proteinase inhibitor , be one of the precursor protein of cornified cell envelope of keratinocyte and be express during the late stage of keratinocyte differentiation .