GxA List Experiments

List gene expression experiments from EBI Gene Expression Atlas. Can filter by species (e.g., 'Homo sapiens') and experiment type ('baseline' for tissue expression, 'differential' for condition comparisons). The Atlas contains 4,500+ experiments across hundreds of species. Example: filtering by 'Homo sapiens' and 'baseline' returns 123 human tissue-level expression experiments including E-MTAB-2836 (122 human tissues), E-MTAB-2706 (675 cancer cell lines), and E-GEOD-46817 (melanoma).