Residue chain ID

[michal2am]

I am working on the system with a heteromeric protein (two type a subunits, two type b subunits and one type c subunit). Is it somehow possible to get the chain id of the residues that are forming contacts with lipids? For example, lets say that there is a residue Ala200 that is a part of detected binding site 0, and this residue is present in subunit type a. Are the statistics (occupancy etc) for both Ala200 residues? Are they a sum or average values? Or are they for one of the two a subunits (if so, which one?). Also - what happens, if Ala200 residue is present in both type a and type b subunits, but those are two completely different residues (the same number and residue type is just a coincidence)?