• 1. Blood Group Antigen Gene Mutation Database (dbRBC)
• NCBI. The Blood Group Antigen Gene Mutation Database (dbRBC) documents variations in genes that directly or indirectly affect blood groups. It thus is a locus-specific mutation database (LSDB) that covers multiple genes.

• 2. BTKbase: X-linked agammaglobulinemia (XLA) | Main page |
• Search for information on defects in the Bruton tyrosine kinase (BTK) gene, which causes agammaglobulinemia (XLA). USE WITH CAUTION: DATABASE HAS NOT BEEN UPDATED SINCE 2008.

• 3. Genome Variation Server
• The Genome Variation Server (GVS) is a local database hosted by the SeattleSNPs Program for Genomic Applications (PGA). The objective of this database is to provide a simple tool for rapid access to human genotype data found in dbSNP, and to provide tools for analysis of genotype data.

• 4. HGVS; Human Genome Variation Society's Variation Databases and Related sites
• The HGVS' list of variation databases includes SNP and locus specific databases. Users are encouraged to check the currency of databases when using them.

• 5. MutDB
• The goal of MutDB is to annotate human variation data with protein structural information and other functionally relevant information, if available. The mutations are organized by gene.