zap;
load po.pdb;
wireframe 15;
select all;
spacefill 100%;

select all; color [100,100,100]; color bonds [180,180,180]; select none;

select atomno=16; color [225,0,0]; select none;

select atomno=16, atomno=23, atomno=6, atomno=7, atomno=24, atomno=14, atomno=18; color bonds [225,0,0]; select none;

select atomno=23, atomno=6, atomno=7, atomno=24, atomno=14, atomno=18; color [180,180,180]; select none;