Extended Data Table 3:

Amino acid stock solutions

Amino Acids	Catalog Number	g/50mL	Suspend in:
L-Alanine	Sigma, A7469	1.1	H2O
L-Asparagine	Amresco, 94341	1.03	H2O
L-Aspartic Acid	Alfa Aesar, A13520	1.17	0.5N NaOH
L-Glutamine	Amresco, 0374	1.12	H2O
L-Histidine	Amresco, 1B1164	0.65	H2O
L-Isoleucine	Amresco, E803	1.12	H2O
L-Leucine	Sigma, L8912	2.03	0.2N HCl
L-Methionine	Amresco, E801	0.6	H2O
L-Phenylalanine	Sigma, P5482	1.01	H2O
L-Threonine	Sigma, T8441	1.11	H2O
L-Tryptophan	Amresco, E800	0.32	H2O
L-Valine	Amresco, 1B1102	1.2	H2O
L-Arginine HCl	Amresco, 0877	8.16	H2O
L-Cysteine	Sigma, 30089	1.71	1N HCl
L-Glutamic acid	Alfa Aesar, A12919	7.59	H2O
L-Glycine	Alfa Aesar, A13816	3.84	H2O
L-Lysine HCl	Amresco, 0437	6.83	H2O
L-Proline	Sigma, P5607	4.89	H2O
L-Serine	Sigma, S4311	6.89	H2O
L-Tyrosine	Sigma, T8566	**add Tyr powder	N/A