Furthermore, APN has been proved to be identical to a human lymphocyte surface cluster differentiation antigen CD13, and to behave as a receptor for corona-viruses TEGV and 229E in humans.

• 业已证明,APN与人淋巴细胞表面分化抗原(CD13)为同一物质,同时,APN还是冠状病毒229E和TEGV受体。