Point taken. I hope it's a bit clearer now. On your other point, human red blood cells I believe are pretty much stuck with their initial load of hemoglobin. Mammalian red blood cells don't have cell nuclei, so they can't be doing much de novo synthesis of any protein. Reptile blood cells do have nuclei (or [Jurassic Park]? would have lost its major plot premise), so they might do synthesis. I'm not a herpetologist so I don't know.