passages.id: split_6_test_2810_passage
passages.type: progene_text
passages.text: Arabinan , a component of the pectic polysaccharide rhamnogalacturonan I , is composed of arabinosyl residues connected via various glycosidic linkages , and therefore , the biosynthesis of arabinan is likely to involve more than one arabinosyltransferase .