PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 3358265-6 1988 A model in which X1 accumulated in proportion to the PO2 and disappeared by first-order decay during periods of low O2 exposure was modified to include an effective rate constant for changes in X1: dX1/dt = a.PO2 + K1. PO-2 53-56 x1 Drosophila melanogaster 17-19