The hydrations (number of bound water molecules) of the amino-acid residues as indicated by n.m.r. measurements
Residue	Hydration no.	Residue	Hydration no.
Polar		Ionized
Asn	2	Asp-	6
Gln	2	Glu-	7
Pro	3	Tyr-	7
Ser	2	Arg+	3
Thr	2	His+	4
Trp	2	Lys+	4
Asp	2
Glu	2	Non-polar
Tyr	3	Ala, Gly	1
Arg	3	Ile, Leu	1
Lys	4	Phe	0
		Met, Val	1
Pethig p.136

Reference: I.D. Kuntz, J. Am. Chem. Soc., 93, 514 (1971)