To construct the blastp database, we retrieved all genome records for HCoV-NL63 (taxid:277944; n = 71), HCoV-229E (taxid:11137; n = 41), HCoV-HKU1 (taxid:290028; n = 33) and HCoV-OC43 (taxid:31631; n = 206) on NCBI Virus. Only accessions for genomes isolated from human...