Dear Elaine,

I checked the useful link.

I opened pr.pdb file (#0).

I used pdb2pqr. Then, a new pdb file was created.

I opened this new file (#1). Then, I used apbs molecule #1.

Then, I opened created dx file.

Unfortunately, surface is black and white.

I confused. Which part of my steps is wrong?

Please guide me to resolve this problem.