Read the following passage and answer if the question is true or false.
Passage: Nucleated red blood cells in mammals consist of two forms: normoblasts, which are normal erythropoietic precursors to mature red blood cells, and megaloblasts, which are abnormally large precursors that occur in megaloblastic anemias.

Question: did red blood cells ever have a nucleus?

Is the answer True or False? Respond with only "True" or "False" and no additional text.
True
True. The passage states that both normoblasts and megaloblasts are nucleated red blood cell precursors.