BiFC(bimolecular fluorescence complementation) is a useful method to study protein interaction. But what makes me surprised is that the usage is enriched in plant research field. I have no detailed statistics data for this observation but if you search this method, BiFC, besides the method-developemnt papers, mostly are plant related. Why? I am a researcher in animal cell filed and I have never seen a animal-cell paper using BIFC to study protein-protein interaction. I thinks it is abnormal. why?I want to used BiFC to sduty a protein-protein interaction in human and mouse cell lines but when I found that the BiFC is a hot-star in plant research field but is alone and seems be forgotten in animal cell research field, I am hesitating. Anyone knows the reason for this strange phenomenon?