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فعالسازی سر
The head activator
These experiments have been interpreted to indicate the existence of a head activation gradient (highest at the hypostome) and a foot activation gradient (highest at the basal disc).
The head activation gradient can be measured by implanting rings of tissue from various levels of a donor hydra into a particular region of the host trunk (Wilby and Webster 1970; Herlands and Bode 1974; Mac- Williams 1983b).
The higher the level of head activator in the donor tissue, the greater the percentage of implants that will induce the formation of new heads.
The head activation factor is concentrated in the hypostome and decreases linearly toward the basal disc.
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