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