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INTRODUCTION 201 OUTLINE OF EARLY XENOPUS DEVELOPMENT ....... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 202 CYTOPLASMIC LOCALIZATION IN OOGENESIS . .... . 208 REGiONAL SPECIALIZATION IN THE FIRST CELL CYCLE 210 PREPARATIONS FOR GASTRULATION ... . . . 2 1 3 TIMING O F GASTRULATION ....... . . . . ... . . . 216 CELLULAR MECHANISMS O F GASTRULATION ...... . 217 Epiboly by the Ani m al Cap 217 Convergent Extension by the Ma rginal Zone . . . ... . . . 219 Spread ing Migra tion by the Deep Zone . . . . 220 Apical Contraction by the Bottle Cells 221 The Vegetal Ba se . . . . . . . . . . .... . . . . . . . . . . . ......... . . . . 222 CELLULAR AND REGiONAL DETERMINATION IN THE EARLY GASTRULA .. . . . . 223
Gerhart et al. (Sat,) studied this question.
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