The function of IL5RA (interleukin 5 receptor subunit alpha, ENSG00000091181) is as follows. Cell surface receptor that plays an important role in the survival, differentiation, and chemotaxis of eosinophils (PubMed:9378992). Acts by forming a heterodimeric receptor with CSF2RB subunit and subsequently binding to interleukin-5 (PubMed:1495999, PubMed:22528658). In unstimulated conditions, interacts constitutively with JAK2. Heterodimeric receptor activation leads to JAK2 stimulation and subsequent activation of the JAK-STAT pathway (PubMed:9516124). {ECO:0000269|PubMed:1495999, ECO:0000269|PubMed:22528658, ECO:0000269|PubMed:9378992, ECO:0000269|PubMed:9516124}.