What's the plural form of coexpression? Here's the word you're looking for.
Answer
The noun coexpression can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be coexpression.
However, in more specific contexts, the plural form can also be coexpressions e.g. in reference to various types of coexpressions
or a collection of coexpressions.
