Abstract
Liver arginase hydrolysed carbamidoarginine with the production of urea and o-carbamidoornithine. The latter, hitherto unknown, was described and a new anhydride, probably 3-uramino-2-piperidone, was prepared. The action of arginase on carbamidoarginine was 165 times less than on arginine (pH optima identical). The specificity of arginase was discussed.

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