1073450878ENSG00000066923ENSMUSG00000036928Q9UJ98O70576NM_001282716NM_001282717NM_001282718NM_012447NM_016964NP_001269645NP_001269646NP_001269647NP_036579NP_058660Stromal antigen 3 is a protein that in humans is encoded by the STAG3 gene. STAG3 protein is a component of a cohesin complex that regulates the separation of sister chromatids specifically during meiosis. STAG3 appears to participate in sister-chromatid cohesion throughout the meiotic process in human oocytes. Stromal antigen 3 is a protein that in humans is encoded by the STAG3 gene. STAG3 protein is a component of a cohesin complex that regulates the separation of sister chromatids specifically during meiosis. STAG3 appears to participate in sister-chromatid cohesion throughout the meiotic process in human oocytes. A homozygous 1-bp deletion inducing a frameshift mutation in STAG3 causes premature ovarian failure.