restrict *A
select  *A and ((((asp or glu) and not *.O and oxygen) and within(3, (lys or arg or his) and not *.N and nitrogen)) or (((lys or arg or his) and not *.N and nitrogen) and within(3, (asp or glu) and not *.O and oxygen)))
cpk 150
color cpk
label %n, %r
set fontsize 8
select *A and not *.O and oxygen and (asp or glu)
set labeloffset 0 15
select *A and not *.N and nitrogen and (lys or arg or his)
set labeloffset -10 -6 
zoom 90
select charged and *A.ca
label %n %r
color translucent 1
select all and not *A
color chain
set fontsize 3
wireframe 1
color translucent 0.8745
select not within (4.0, ASP.OD2 or GLU.OE2) and (ARG.CZ or ARG.NH1 or ARG.NH2 or LYS.NZ or HIS.NE2 or HIS.ND1 or HIS.CE1 or HIS.CD2 or HIS.NG2)
color translucent