After unilateral ablation of the midbrain in Xenopus laevis tadpoles (at stage 47-48 according to Nieuwkoop and Faber) most of the newly formed material originates from the contralateral part; it is in fact this region which displays the maximum mitotic increase following the operation. Such an increase is evident at the level of both the alar plate and the basal plate of the contralateral region. The cephalic and caudal stumps as well cooperate in the regeneration of the removed part. Nevertheless, the role which these two regions play in the regenerative process is remarkably lower than that of the contralateral side. This is demonstrated by a lower mitotic increase and by a shorter period of increased cell proliferation than that of the residual side. Furthermore, it was observed that as far as the maximal mitotic activity period is concerned (5th day after the operation) a higher number of mitoses take place than in the control even in regions which are far from the place of operation. This data is discussed here.
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Con il contributo del Ministero per i Beni e le Attività Culturali