Hi Abril,
If residues are buried inside the protein they may have an area of 0.0 -- this is expected.  If there was a problem,  I believe there would be an error message.
I hope this helps,
Elaine
-----
Elaine C. Meng, Ph.D.                       
UCSF Chimera(X) team
Department of Pharmaceutical Chemistry
University of California, San Francisco

> On Jun 15, 2023, at 2:13 PM, Abril Gijsbers via Chimera-users <chimera-users@cgl.ucsf.edu> wrote:
>
> Hi,
> I calculated the SASA from an AlphaFold model and a homology model with Chimera. Some of the residues got a value of zero and I just wanted to know if that means that those residues are not accessed to the solvent at all or could be a problem in the calculation?
>
> Best regards,
> Abril