To clarify, the "alphafold match" command would get already-made single-chain models from the freely available AlphaFold Database. It does not run a new AlphaFold calculation. It just superimposes the single-chain predictions onto the multimer structure that was already open, which is not the same as using it to predict a multimer. However, in practice the result is often quite reasonable, if there are already experimentally known structures with the same type of multimerization. I also meant to include more help links in the previous reply... matchmaker <https://rbvi.ucsf.edu/chimerax/docs/user/commands/matchmaker.html> combine <https://rbvi.ucsf.edu/chimerax/docs/user/commands/combine.html> Model Loops <https://rbvi.ucsf.edu/chimerax/docs/user/tools/modelloops.html> Best, Elaine