Amino Acid Sidechain Structures

Name	Symbol	Mass (-H2O)	Side Chain	Occurence (%)
Alanine	A, Ala	71.079	CH3-	7.49
Arginine	R, Arg	156.188	HN=C(NH2)-NH-(CH2)3-	5.22
Asparagine	N, Asn	114.104	H2N-CO-CH2-	4.53
Aspartic acid	D, Asp	115.089	HOOC-CH2-	5.22
Cysteine	C, Cys	103.145	HS-CH2-	1.82
Glutamine	Q, Gln	128.131	H2N-CO-(CH2)2-	4.11
Glutamic acid	E, Glu	129.116	HOOC-(CH2)2-	6.26
Glycine	G, Gly	57.052	H-	7.10
Histidine	H, His	137.141	N=CH-NH-CH=C-CH2- |__________|	2.23
Isoleucine	I, Ile	113.160	CH3-CH2-CH(CH3)-	5.45
Leucine	L, Leu	113.160	(CH3)2-CH-CH2-	9.06
Lysine	K, Lys	128.17	H2N-(CH2)4-	5.82
Methionine	M, Met	131.199	CH3-S-(CH2)2-	2.27
Phenylalanine	F, Phe	147.177	Phenyl-CH2-	3.91
Proline	P, Pro	97.117	-N-(CH2)3-CH- |_________|	5.12
Serine	S, Ser	87.078	HO-CH2-	7.34
Threonine	T, Thr	101.105	CH3-CH(OH)-	5.96
Tryptophan	W, Trp	186.213	Phenyl-NH-CH=C-CH2- |___________|	1.32
Tyrosine	Y, Tyr	163.176	4-OH-Phenyl-CH2-	3.25
Valine	V, Val	99.133	CH3-CH(CH2)-	6.48

The amino acid occurence statistics were compiled using the NCBI database.