has part has part has_part is AA variant of has mutated from has amino acid position asparagine arginine SARS-CoV-2 Lambda variant AA variant in SARS-CoV-2 S protein S1 RBD region R246N in SARS-CoV-2 S protein 452 Anthony Huffman An AA mutation or AA variant that has mutated an amino acid at position 452 into aspargine in S protein. https://cov-lineages.org/ S-R246N