Word: pupa
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...other hand, when sex cells were placed in the blood of the dormant pupa--where the hormone is absent, and where the animal is not growth--the sex cells underwent no change...
Sleeping Pupa.The three "cytochrome" enzymes are basic growth factors. Present in human beings as well as in silkworms, they control the utilization of oxygen in the tissues. Without them growth is impossible. The dormant Cecropia pupa contains no cytochrome enzymes. Therefore it cannot grow until they are provided by the chain of hormones that starts in its brain...
Wakening Discs. When the caterpillar is full-sized, its tissues dissolve to form a yolky fluid. The imaginal discs wake up suddenly. Nourished by the fluid, they burst into furious growth, constructing within the larva's old skin an entirely new insect: the hibernating pupa. Later, a similar burst of growth turns the pupa into the adult moth...
Glands in the silkworm secrete the hormone which controls the production of an enzyme called cytohrome. This cytochrome is directly responsible for the growth and metamorphosis of the silkworm. Without it, the insect cannot change from caterpillar to pupa to moth. Such an enzyme in a human may be the cause of the malignant growths called cancers...
Down the ball from the mice and monkeys is a room full of moth pupas, with their brains cut out. The pupa is the animal inside a cocoon; and Assistant Professor Carroll M. Williams has found that it will live indefinitely but not grow when its brain is removed. He has kept pupas for months in animated suspension and then put their brains back, and they started growing where they left...