ANPEP and infection: The positive control showed SARS-CoV-2 pseudoviruses could bind to ACE2 receptors (S2D Fig), but the IFA and qRT-PCR results provided no evidence of enhanced infection or entry into hACE2- or hAPN-expressing cells by cpCoVs (S2 and S3 Figs), suggesting that none of these surface molecules function as entry receptors for the novel virus.