-, 9-O-Ac-Sia, 9-O-acetylated sialic acid, Attachment Receptor Determinant, HAE, HE, HKU1, HKU1-HE, HKU1-HE protein, HKU1-S1, Hemagglutinin-Esterase Protein, Human Coronavirus, Human coronavirus (hCoV) HKU1, Human coronaviruses, O, O-Ac-Sia, O-Acetylated Sialic Acid, O-acetylated sialic acid, O-acetylesterase, OC43, OC43-HE, RD, RD cells, RDE, S1, S1 domain, cellular, esterase, hCoV, hCoV-, hCoV-HKU1, hCoV-HKU1 spike, hCoV-OC43, hCoVs, hemagglutinin, hemagglutinin-esterase, host cells, human, human rhabdomyosarcoma cell line, mouse, neuraminidase, nor, nor rat and mouse erythrocytes, primary human ciliated airway epithelial (HAE) cell cultures, rat, rhabdomyosarcoma, sialate, sialate-O-acetylesterase, sialic acid, sialic acids, trypsin