C distance and angle dependent SS bond potential.
cmc if (ii.gt.nres .and. itype(iii).eq.1 .and. itype(jjj).eq.1) then
C 18/07/06 MC: Use the convention that the first nss pairs are SS bonds
C distance and angle dependent SS bond potential.
cmc if (ii.gt.nres .and. itype(iii).eq.1 .and. itype(jjj).eq.1) then
C 18/07/06 MC: Use the convention that the first nss pairs are SS bonds