sentence: Analysis of transcripts from a human fetal brain library , however , revealed two types of ADAM10 cDNAs : one encoding a 748 amino acid protein [ designated Kuzbanian ( Kuz ) L ] and a second one ( KuzS , encoding a 568 amino acid protein ) , which lacks the cysteine-rich , transmembrane , and cytoplasmic domain ( Yavari et al ., 1998 ) .