Yes.  To elaborate a little, it's missing-structure pseudobonds between the last backbone atom of one polymeric residue and the first backbone atom of another.  Also, there are analogous criteria for nucleic-acid bonds / missing-structure pseudobonds.

--Eric

On Dec 2, 2020, at 11:39 AM, Daniel Esteban Palma Igor <daniel.palma.i@ug.uchile.cl> wrote:

Ahh ok. After reading some comments in the code and doing some testing, at least in proteins, the chain expands whenever a bond is created between C and N atoms of different residues, and when a "missing structure" pseudobond is created between CA atoms, is that correct?

On Wed, 2 Dec 2020 at 14:37, Eric Pettersen <pett@cgl.ucsf.edu> wrote:
Hi Daniel,
        A Chain should "create itself" as the appropriate inter-residue polymeric bonds are formed.

--Eric

        Eric Pettersen
        UCSF Computer Graphics Lab


> On Dec 2, 2020, at 7:22 AM, Daniel Esteban Palma Igor <daniel.palma.i@ug.uchile.cl> wrote:
>
> Hi, is there a way to add a Chain object to an AtomicStructure?
> Regards,
> Daniel Palma Igor
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