Summary
From 4 serum aminopeptidases (2 of pregnant and 2 of nonpregnant women's sera), the placental lysosomal (mol. wt 320,000) splits Lys-NAp only. B-Cys-NAp is hydrolyzed from the both placental enzymes, i.e. lysosomal and microsomal (mol. wt 145.000) AP. Ala-NAp is split by both nonpregnant serum AP more readily than Leu-NAp.
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Rybák, M., Rybáková, B. & Petáková, M. The hydrolysis of some L-amino acid-p-nitranilides with the normal and pregnant's serum aminopeptidases. Experientia 34, 28–29 (1978). https://doi.org/10.1007/BF01921881
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DOI: https://doi.org/10.1007/BF01921881