zap;
load i.pdb;
wireframe 15;
select all;
spacefill 90%;

select (atomno<50), (atomno>200 and atomno<250);
color [148,0,148]; 
color bonds [180,180,180]; 
select none;

select (atomno>100 and atomno<150); 
color [0,0,225]; 
color bonds [0,0,2205]; 
select none;