title: Daily rhythm in tyrosine concentration in human plasma: persistence on low-protein diets.
abstract: The concentration of tyrosine in the plasma of normal males varies diurnally. It is lowest (9.5 +/- 0.35 micrograms per milliliter) between 0130 and 0230 hours and rises to a peak of 16.2 +/- 0.82 micrograms per milliliter by 1030 hours. This rhythm persists when subjects are maintained for 2 weeks on a diet that is very low in protein.
mesh_terms: D015065:17-Hydroxycorticosteroids / Q000097:blood; D000293:Adolescent; D000328:Adult; D002940:Circadian Rhythm; D004044:Dietary Proteins / Q000494:pharmacology*; D006801:Humans; D008099:Liver / Q000201:enzymology; D008297:Male; D005082:Physical Exertion; D014443:Tyrosine / Q000097:blood*; D014444:Tyrosine Transaminase / Q000378:metabolism
chemical_list: D015065:17-Hydroxycorticosteroids; D004044:Dietary Proteins; D014443:Tyrosine; D014444:Tyrosine Transaminase