High-affinity receptor for interleukin-15 (PubMed:8530383). Can signal both in cis and trans where IL15R from one subset of cells presents IL15 to neighboring IL2RG-expressing cells (By similarity). In neutrophils, binds and activates kinase SYK in response to IL15 stimulation (PubMed:15123770). In neutrophils, required for IL15- induced phagocytosis in a SYK-dependent manner (PubMed:15123770). Expression of different isoforms may alter or interfere with signal transduction (PubMed:10480910). {ECO:0000250|UniProtKB:Q60819, ECO:0000269|PubMed:10480910, ECO:0000269|PubMed:15123770, ECO:0000269|PubMed:8530383}. [Isoform 5]: Does not bind IL15. . [Isoform 6]: Does not bind IL15. . [Isoform 7]: Does not bind IL15. . [Isoform 8]: Does not bind IL15. . This is the function of IL15RA (interleukin 15 receptor subunit alpha, Ensembl gene identifier ENSG00000134470).