Assertion: tryptophan | /r/CapableOf | compete with other amino acids
Facets:
value: to overcome this barrier
type: PURPOSE
Source sentences:
text: However, tryptophan has to compete with other amino acids to overcome this barrier.
text: If tryptophan has to compete with other amino acids to cross the blood-brain barrier, it is more probable that it becomes serotonin in the liver.