MYH9 and neoplasm: While, as expected given the efficiency of the digestion conditions, we found no O-GlcNAc-modified peptides by MALDI imaging after on-tissue BtOGA action, a collection of peptides representing abundant proteins in tumor tissue, such as α-hemoglobin and myosin heavy-chain 9, were identified (Table S3) indicating a high glycemic status at the time the tissue was collected [69].