Larger Image pklr gene expression in Xenopus tropicalis embryo via in situ hybridization, NF stage 28, lateral view, anterior left. Copyright © Papalopulu Lab, Nancy Papalopulu Xenopus pklr / pyruvate kinase, liver and RBC gene expression in stage 28 embryo. Clone TEgg010a16 Copyright © Papalopulu Lab Gene Synonyms Species Stage(s) Tissue pklr pk1, pyruvate kinase X. tropicalis Throughout NF stage 28 muscle notochord head region trunk Image source: Community submitted Permanent Image Page Printer Friendly View XB-IMG-24198