- Human endometrial stromal cells and decidual cells express cluster of differentiation (CD) 13 antigen/aminopeptidase N and CD10 antigen/neutral endopeptidase. Imai, K., Maeda, M., Fujiwara, H., Okamoto, N., Kariya, M., Emi, N., Takakura, K., Kanzaki, H., Mori, T. Biol. Reprod. (1992)