168
P A U L B R I E N
FIG. 12. Example of dedifferentiation at the level of the swelling of the wall of
the polyp of Cladonema radiata, destined to form a bud. A t a strictly localized
blastogenic site, the ectodermal and endodermal cells of the polyp wall become
P A U L B R I E N
FIG. 12. Example of dedifferentiation at the level of the swelling of the wall of
the polyp of Cladonema radiata, destined to form a bud. A t a strictly localized
blastogenic site, the ectodermal and endodermal cells of the polyp wall become