Abstract
1. The eye-antennal discs from the mature third-instar larvae (95 hours old after hatching at 25°C) of D. melanogaster were cultured in vitro in a synthetic medium, to investigate some effects of the cephalic complexes cultured together.
2. In comparison with culturing the eye-antennal discs alone, the culture of the eye-antennal discs together with the cephalic complexes showed more pronounced growth and differentiation of the eye discs.
3. The cephalic complexes of Oregon larvae were found to have effects of promoting growth and differentiation of the Oregon strain upon the eye discs of Bar larvae as well as those of Oregon larvae.
4. The cephalic complexes of Bar larvae showed to have effects performing the development of the Bar strain upon the eye discs of Oregon larvae as well as those of Bar larvae.
5. Those facts suggest that the genie action appears first on the brain and the“ring gland”in the cephalic complex, which then influence the growth and differentiation of the eye disc.
