protein binding exogenous protein binding GO:0140272 pg 2018-10-01T10:03:21Z Note that as GO captures normal processes, it may be that exogenous proteins interactions are normal for one of the participating species but not the other. Therefore reciprocal annotations should not be made without confirming that it is physiological relevant. molecular_function Binding to a protein or protein complex from a different species, for example a pathogen molecule binding to a host protein.