AARP	CTT peptide-endostatin mimic-kringle 5, a specific fusion protein
AD-SoS	Amplitude-dependent speed of sound
BH4	Tetrahydrobiopterin
CNS	central nervous system (CNS)
DHA	Docosahexaenoic acid
GBA	Gut–brain axis
GMP	Glycomacropeptide
HPA	Hyperphenylalaninemia
IQ	Intelligence quotient
IGF-1	Insulin-like Growth Factor 1
Kyn	(Trp) and kynurenine
LNAA	Large neutral amino acids
LPS	Lipopolysaccharides
MPKUS	Maternal PKU syndrome
PAL	Phe ammonia lyase
Phe	Phenylalanine
PKU	Phenylketonuria
PUFAs	Polyunsaturated fatty acids
QOL	Quality of life
Trp	Tryptophan
Tyr	Tyrosine