For adult organisms, as with the developing embryo there is no
reason to assume the existence of two clearly distinct cell types
i.e., the myeloblasts and the lymphoblasts.
In mammalian organisms a sinlge type of cell exists, i.e. the
lymphocyte, in the broadest sense of the term, which both looks
different and may produce a variety of differentiation progeny
depending on their current location and survival factors.
The lymphocytes are ubiquitous, equivalent for all places and
are indistinguishable from one another by means of histological or
hematological approaches. In adenoid tissue, during homoplastic
proliferation, they always produce lymphocytes.
An easily transportable cellular form emerges,a small
lymphocyte which circulates in the blood and lymph flow, moving
throughout the body, until , after a certain period of
inactivation, it unfolds its ability for development.