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