passages.id: split_1_test_1805_passage
passages.type: progene_text
passages.text: In Brassica self - incompatibility , recognition between pollen and the stigma is controlled by the S locus , which contains three highly polymorphic genes : S-receptor kinase ( SRK ) , S-locus protein 11 ( SP11 ) ( also called S-locus cysteine - rich protein ; SCR ) and S-locus glycoprotein ( SLG ) .