Base Colors: CPK Standard Standard+H Magenta Backbone Color: CPK L_Maroon Yellow Hbonds White-Yellow (on - off) Isosurface (on - off) (load) Isosurface (on - off) (calculated) All hydrogen atoms present in the "DNA Backbone" are omitted To check the hydrogen bonds between the bases, change the Backbone color to "L_Maroon", zoom in on some particular base pairs and then activate "Hbonds"; this way you can highlight the hydrogen atoms of the bases involved in the bond and those that are not. To better highlight the different bases, use their "Standard+H" color with a Backbone "L_Maroon" color.