There is also an intermediate phase between the myeloblast and these primitive reticulum cell, namely the hemocytoblast.

CFU-Me (pluripotential hemopoietic stem cell or hemocytoblast) megakaryoblast promegakaryocyte megakaryocyte.

In his research of haematopoiesis, Ferrata helped demonstrate the systemic nature of leukemia, leading him to support an hypothesis that elements of the blood (erythrocytes, leukocytes, and blood platelets) all originate from the hemocytoblast, a direct descendant of a mesenchymal cell, which he referred to as an emoistioblasto (hemohistioblast).