2.4.1.215 cis-zeatin O-beta-D-glucosyltransferase cob lower level of mRNA 2.4.2.24 1,4-beta-D-xylan synthase cob immature 2.7.1.158 inositol-pentakisphosphate 2-kinase cob immature ear 2.7.2.3 phosphoglycerate kinase cob predominant expression of isoform Pgk3 2.7.12.2 mitogen-activated protein kinase kinase cob -