"interactions among different" is correct and usable in written English.
Example: The researchers studied the interactions among different species of plants in the ecosystem.
And in an age when citizens had no doubt where they stood in the ruthless pecking order, interactions among different classes of people were regulated by a sense of honor.
Moreover, also interactions among different molecules are not studied.
Policy innovation is a complicated political process that involves various interactions among different policy actors.
After optimization, transformation efficiency was 26.2% and there were no interactions among different factors.
The interaction energy is an important measure of the interactions among different constituents of composites.
For example, interactions among different individuals involved in the project likely exert effects that we did not measure.
This is why the interethnic marriage rate can be used to measure the degree of interactions among different ethnic groups.
Firstly, the complex interactions among different biological processes make it difficult to study one aspect at one time.
The transport and the hydrologic modules are tightly coupled and the interactions among different hydrologic components are explicitly modeled.
Our model employs tissue explants to test compounds for toxicity which arises with the metabolic interactions among different cell types.
Tight interactions among different cell types contributing to bone formation are of key importance in the maintenance of bone homeostasis.
