Create a Ligand-Receptor DB without complexes and cofactors

[earmingol]

Hi @sqjin

I'm wondering if it's possible to use CellChat with a list of LR pairs that does not contain complexes and cofactors (it's from another organism too). I tried passing empty matrices for CellChatDB$complex and CellChatDB$cofactor but I looks like that it doesn't work.

I would really appreciate your help!