CH	Casein hydrolysate
CH-P	Plastein reaction-modified CH in the absence of extrinsic Phe or Trp
CH-P-Phe	Plastein reaction-modified CH in the presence of extrinsic Phe
CH-P+Phe	Mixture of CH and extrinsic Phe
CH-P-Trp	Plastein reaction-modified CH in the presence of extrinsic Trp
CH-P+Trp	Mixture of CH and extrinsic Trp
CCK-8	Cell counting kit-8
EDTA	Ethylenediamine tetra-acetic acid
FBS	Fetal bovine serum
PBS	Phosphate-buffered saline
Trp	Tryptophan
Phe	Phenylalanine
Ethanol	ETOH