PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 14738-3 1977 After 30 min in a 12% oxygen environment there were significant reductions of tyrosine hydroxylase and tryptophan hydroxylase activity at 1,14 and 28 but not 4 days of postnatal age. Oxygen 22-28 tyrosine hydroxylase Rattus norvegicus 78-98