!  rgdw  selection definitions
 
define wat  sele ( segid w ) end
define prot sele (.not. segid wat ) end
 
define nonh sele ( .not. hydrogen ) end
define back sele ( type n .or. type ca .or. type c ) end
define main sele ( type n .or. type ca .or. type c .or. type o .or. type ot1 -
                   .or. type ot2 ) end
define side sele ( (.not. main ) .and. prot ) end

