delete atom sele segm name #* end key old sele all end make bond from residue sele segm name CB* .a work end dele bond sele atom name CA .a bond range 4.0 1000. end symmetry sele segm name CB* .a atom name CA .a work end - around center atom $1 dist 80. neigh 2 image sele .not old end col 150 bond key old sele all end dele bond sele segm name CB* .and atom name CA end return make bond from residue sele segm name MO* end symmetry sele atom name CA end around center atom $1 dist 50. neigh 2 key symm_ca sele .not old end dele bond sele symm_ca .a bond range 5.0 2000. end image sele symm_ca end col 105 bond delete bond sele atom name CA sele segm name MO* end return