As described above, PPIs and thus whole interactomes can be predicted. While the reliability of these predictions is debatable, they are providing hypotheses that can be tested experimentally. Interactomes have been predicted for a number of species, e.g.
* Human (Homo sapiens)
* Rice (Oryza sativa)
* Xanthomonas oryzae
* Arabidopsis thaliana
* Tomato (Solanum lycopersicum)
* Field mustard (Brassica rapa) 
* Maize, corn (Zea mays)
* Poplar (Populus trichocarpa)
* SARS-CoV-2