I know his is a silly post…. but i bet that actin filaments (generally regarded to be about 7nm in diameter), and intermediate filaments (generally regarded to be about 10nm) and microtubules (generally regarded as something between 20-24nm) really are really a set of prime numbers.  Not in sense of being precisely that number of nanometers, … but in the awesomeness of as yet unknown coding in DNA structures  with prime number-like uniquenesses, pseudorandom, …which just happens to show up to microscopists in unique circumstances, such as the cytoskeletal elements, that show up as “sets” of PRIME NUMBERs.