The Effect of Bleeding on the Proportion of Red Fluorescing Forms among the Total Normoblasts of Bovine Porphyric Bone Marrow

The percentage of fluorescing, porphyrin rich normoblasts in the bone marrow of five bovine porphyrics increased after bleeding to a range of 66-91 per cent, as contrasted with 26-50 per cent in the same animals before bleeding. This is believed to be more in accord with a uni- than a bimodal distribution of normoblasts in respect to the genetic abnormality and the resultant overproduction of porphyrin.