References/Notes/Attributions:
Source
Krause, Halminski, McDonald, Dembure, Salvo, Freides, and Elsas (1985) "Biochemical and Neuropsychological Effects of Elevated Plasma Phenylalanine in Patients with Treated Phenylketonuria," J. of Clinical Investigation, Volume 75, January 1985, 40-48
Several of the values were altered slightly in ways that would not change the analysis except to simplify the arithmetic.