Table 4.

Principal morphological characters of myofibroblast

Myofibroblasts not related to lymphocytes	Myofibroblasts related to lymphocytes
SMA-1 and caldesmon high intensity	SMA-1 and caldesmon low intensity
Bordering PALS	Inner PALS
Marginal-perifollicular myofibroblastic double ring	Germinal-marginal myofibroblastic double ring
They would correspond with the filtration beds and barrier cells described by Weiss65,70,71	In close association with T and B lymphocytes In continuity with FDCs mesh in the seccondary follicles