SARS Coronavirus 2 B.1.621

**Semantic type:** Virus

**Definition:** A variant lineage of SARS coronavirus 2 where the following variations in the spike glycoprotein sequence have been identified: an amino acid insertion 146N and amino acid substitutions T95I, Y144T, Y145S, R346K, E484K, N501Y, D614G, P681H and D950N.

**Synonyms:** - B.1.621 - Mu - Mu (B.1.621) - SARS Coronavirus 2 Variant Lineage B.1.621 - SARS-CoV-2 B.1.621 - SARS2 B.1.621