2 C 12.01 ; sp2 C carbonyl group
3 CA 12.01 ; sp2 C pure aromatic (benzene)
4 CB 12.01 ; sp2 aromatic C, 5&6 membered ring junction
5 CC 12.01 ; sp2 aromatic C, 5 memb. ring HIS
6 CK 12.01 ; sp2 C 5 memb.ring in purines
7 CM 12.01 ; sp2 C pyrimidines in pos. 5 & 6
8 CN 12.01 ; sp2 C aromatic 5&6 memb.ring junct.(TRP)
9 CQ 12.01 ; sp2 C in 5 mem.ring of purines between 2 N
10 CR 12.01 ; sp2 arom as CQ but in HIS
11 CT 12.01 ; sp3 aliphatic C
12 CV 12.01 ; sp2 arom. 5 memb.ring w/1 N and 1 H (HIS)
13 CW 12.01 ; sp2 arom. 5 memb.ring w/1 N-H and 1 H (HIS)
14 C* 12.01 ; sp2 arom. 5 memb.ring w/1 subst. (TRP)
17 H 1.008 ; H bonded to nitrogen atoms
18 HC 1.008 ; H aliph. bond. to C without electrwd.group
19 H1 1.008 ; H aliph. bond. to C with 1 electrwd. group
20 H2 1.008 ; H aliph. bond. to C with 2 electrwd.groups
21 H3 1.008 ; H aliph. bond. to C with 3 eletrwd.groups
22 HA 1.008 ; H arom. bond. to C without elctrwd. groups
23 H4 1.008 ; H arom. bond. to C with 1 electrwd. group
24 H5 1.008 ; H arom. bond. to C with 2 electrwd. groups
25 HO 1.008 ; hydroxyl group
26 HS 1.008 ; hydrogen bonded to sulphur
27 HW 1.008 ; H in TIP3P water
28 HP 1.008 ; H bonded to C next to positively charged gr
30 IM 35.45 ; assumed to be Cl-
31 IP 22.99 ; assumed to be Na+
32 IB 131 ; 'big ion w/ waters' for vacuum (Na+, 6H2O)
34 N 14.01 ; sp2 nitrogen in amide groups
35 NA 14.01 ; sp2 N in 5 memb.ring w/H atom (HIS)
36 NB 14.01 ; sp2 N in 5 memb.ring w/LP (HIS,ADE,GUA)
37 NC 14.01 ; sp2 N in 6 memb.ring w/LP (ADE,GUA)
38 N2 14.01 ; sp2 N in amino groups
39 N3 14.01 ; sp3 N for charged amino groups (Lys, etc)
41 O 16 ; carbonyl group oxygen
42 OW 16 ; oxygen in TIP3P water
43 OH 16 ; oxygen in hydroxyl group
44 OS 16 ; ether and ester oxygen
45 O2 16 ; carboxyl and phosphate group oxygen
47 S 32.06 ; sulphur in disulfide linkage
48 SH 32.06 ; sulphur in cystine