Select whole complex 

Color Scheme and Chain Identity

DNA
All: Select  Restrict 
Third of a wrap: Select  Restrict 

Histone proteins
All:  Select  Restrict 
H2A:  Select  Restrict 
H2B:  Select  Restrict 
H3:  Select  Restrict 
H4:  Select  Restrict 
 

Measure distances by mouse clicking 

Mouse click identifies atom or group 

  CREDITS