PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 3395656-8 1988 Energy transfer from tryptophan to a pyridoxamine derivatized side group in RNase increased 40% over 25 degrees C. Here we report further testing of this model in two additional protein systems: calmodulin, a calcium activated regulatory protein, and transferrin, a blood serum iron shuttle. Pyridoxamine 37-49 transferrin Homo sapiens 251-262