Summary
The pattern of segmental contribution of teloblasts in earthworm embryo was examined by injection of the and by studying the timing and symmetry of the first each teloblast bandlet. The changing spatial ectoteloblasts during development was also used to contributions. A mathematical method for determining time of each teloblast is presented. The teloblasts progeny, the blast cells, were found to undergo unique stereotyped patterns of division which lead to equally patterns of contribution in the segments apparent in
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