... Angiotensin-converting enzyme cDNA, obtained by3¢-to5¢ RACE of testis RNAs, codes for a predicted one-domain proteinsimilar to the mammalian germinal isoform of angiotensin-convertingenzyme. All amino ... spermato-zoids, whereas the spermatogonia exhibit very faintstaining only (Fig. 4D). The thickness of the stainingis the result of the morphology of spermatozoid in Astacus. Indeed, the spermatozoid ... underlined), zinc-binding residues (green), chloride-binding residues(orange for the first chloride ion and blue for the second one), sites of glycosylation (red), and cysteine residues forming...