. . . . . . "A variant of the SARS-CoV-2 Spike receptor-binding domain (RBD, 195 residues) produced by one or more amino-acid substitutions from the wild-type Wuhan isolate (UniProt P0DTC2). This class is the type of the anchor FDO (A_r) of a FAIR Digital Twin; all observation FDOs link to it via `mac:isObservationOf` and collectively constitute the FDT." . "Spike RBD Variant" . "2026-05-22"^^ . . . . "Vocabulary term: mac:SpikeRBDVariant (draft, unsigned)" . "RSA" . "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQD3w/IUb755GIzp3ueODYkgELhyq4Clygb5Kspge50xo+n8uC/IvXwi+ukRjEpdfX/JZ09yKUCJ2AMMr/QchrsP1Xhg9Q3fEZ4E12XqFd5jX00Qs0K5XZwjBaV8NdDTJW9I4gpcyh0cry7hSBAWHkXEkqbK+lQvR4UFAKejFq6u/wIDAQAB" . "nRPcX+XMF/C54llycI6908cv9acPXKIph8AWKR1Xfw5rpT3lDOWN1o/wKiJECo91/hO4eoddUds5ImMlHxIIgLIPqw1DIKAVBYV2lDE4dxFiw9FZ4m0fRzCCpH8Zxc4Jkv+F9wJ2n56MHq3d8mVvQq+LiPsv28H+kCLnv4NoNF4=" . . .