Final answer:
Protein-protein interactions can be determined through various analysis techniques, such as mass spectrometry, X-ray crystallography, and nuclear magnetic resonance (NMR).
Step-by-step explanation:
The interaction between proteins can be determined through various analysis techniques. One common technique is mass spectrometry, which identifies and determines the characteristics of a protein molecule. Another technique is X-ray crystallography, which determines the three-dimensional structure of a protein crystal. Nuclear magnetic resonance (NMR) is another technique that uses the magnetic properties of atoms to determine the three-dimensional structure of proteins in solution.