passages.id: split_8_test_1702_passage
passages.type: progene_text
passages.text: A mutant form of the common beta - subunit of the GM-CSF , interleukin-3 ( IL3 ) and IL5 receptors is activated by a 37 residue duplicated segment which includes the WSXWS motif and an adjacent , highly conserved , aliphatic / basic element .