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