These results, taken together, substantiate a physiological role for ecdysteroid, acting via nuclear receptors, in salivary gland degeneration.
Kinetes are released into haemolymph and invade cells of the salivary gland, where they reside until suitable environmental conditions are presented.
Salivary gland chromosome analyses indicated that the mutant flies are chromosomally normal.
It is only when the parasites appear in the salivary gland that the insect becomes infective.
Supernatant from salivary gland sonicate was as effective as that obtained by disruption of the salivary lobes by successive pipetting.
Salivary gland molecules responsible for these activities are beginning to be identified.
However, no paralysis could be induced with tick salivary gland extracts obtained from fed ticks, although feeding ticks caused paralysis in sheep.
Presumably, the salivary gland secretion contains some other substances capable of stimulating cell enlargement.
