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