Article Abstract:
Analysis of the influence of long-range interactions between bud and head on foot formation in four different clones of three species of the Hydra reveals that foot formation in Hydra vulgaris and strain reg-16 of Hydra magnipapillata are cooperatively supported by advanced buds and fully developed heads. The abilities to form buds and heads are increased by the addition of diacylglycerol, while it transiently decreases the ability to form feet. Head regeneration is not stimulated by the foot. Various hypothesis are suggested to explain the pattern formation in Hydra.
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Article Abstract:
Interstitial cells were grafted onto the tentacles of normal hydra, Hydra magnipapillata, to determine whether epithelial cells produce region-specific nerve cell differentiation in hydra. Ganglion and sensory cells appeared in various positions on different days after grafting, indicating that nerve cells do not differentiate randomly in hydra. Instead, differentiation occurs in a region-specific manner in response to cues provided by epithelial cells to produce region-dependent nerve cell differentiation.
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Article Abstract:
Researchers suggested a model for head, tentacle and foot formation in Hydra, that reveals that systems which hint at a positional information scheme may be formed by a group of hierarchically coupled pattern forming systems. This implies that a structure provides the prerequisite for a second structure but excludes this structure locally, thereby forming a controlled society of structures.
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