Functional RNA which acts as a transcriptional coactivator that selectively enhances steroid receptor-mediated transactivation ligand-independently through a mechanism involving the modulating N- terminal domain (AF-1) of steroid receptors. Also mediates transcriptional coactivation of steroid receptors ligand-dependently through the steroid-binding domain (AF-2). Enhances cellular proliferation and differentiation and promotes apoptosis in vivo. May play a role in tumorigenesis. {ECO:0000269|PubMed:10199399, ECO:0000269|PubMed:12943696, ECO:0000269|PubMed:14517287, ECO:0000269|PubMed:15147866, ECO:0000269|PubMed:15351741}. This is the function of SRA1 (steroid receptor RNA activator 1, Ensembl gene identifier ENSG00000213523).