Assertion: tryptophan's level | /r/HasProperty | 20% of total
Facets:
Source sentences:
text: The endogenous synthesis of free D-aspartate was strongly suggested by the finding that the D-aspartate level changed in the chick embryo during incubation of the egg, with a maximum level at 13 d of incubation (20% of total for the eye retina) .