There are several types of gene databases, each serving a unique purpose: - Genomic Databases: These include comprehensive genomic sequences and structural variations. Examples are the [GenBank] and [Ensembl]. - Transcriptomic Databases: These focus on gene expression profiles, such as the [Gene Expression Omnibus (GEO)]. - Proteomic Databases: These catalog information about proteins encoded by genes. The [Human Protein Atlas] is a notable example. - Cancer-specific Databases: These are specialized for cancer research, such as [The Cancer Genome Atlas (TCGA)] and [COSMIC (Catalogue Of Somatic Mutations In Cancer)].