anakmesis

an·ak·me·sis

(an-ak'mē-sis),
Arrest of maturation of leukocytes in their production centers, thereby resulting in greater numbers of young forms and progressively smaller proportions of mature granular cells in the bone marrow, as observed in agranulocytosis.
[G. an- priv. + akmēnos, full grown, fr. akmē, highest point]