[Committed granulomonocytic precursors in human embryonic organs]

By means of a modified Howell semisolid medium it has been established that the relative content of committed stem cells of the myeloid clone in liver and spleen tissues of human fetus, aged between 18 and 24 weeks, is higher by five times than that in the bone marrow of adults. The methods worked out for making preparations of agar cultures and for their morphocytochemical staining may be used for the identification of grown cell elements; they are simple and reproducible.