To whom may concern,

This is Yanhe Zhao from UT Southwestern Medical Center. I have to question when use Chimera as below, hopefully someone could do me a favor to answer it.

1, my crystal structure have four copies in one Asymmetrical structural unit. When I try to combine two of them by selection and combine command, always combine all of them. I pretty sure that I only select two of them;

2, I got one PDB from SASDB, how can I show it as a density map like CryoEM? When I open, it's shown as lines-like map so as to which couldn't be used for docking. 

I really appreciate it if someone could do me this favor. Thanks a lot.

Best,

Yanhe