Apyrase activities in some tissues and cells, such as peripheral vascular endothelial cells, have been reported, but these in endocardium endothelial cells have not been reported.

• 包括血管内皮细胞在内的多种细胞和组织存在腺苷三磷酸双磷酸酶(apyrase), 但心内膜内皮细胞是否含有apyrase尚无报道。