What's the singular form of apoferritin? Here's the word you're looking for.
Answer
The noun apoferritin can be countable or uncountable.
The singular form of apoferritin is also apoferritin.
Examples
Vekilov and Siu-Tung Yau at the University of Alabama in Huntsville used an atomic force microscope to view the protein apoferritin as it crystallizes.