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Diapositive 47 sur 68
This very general structure (apico-caudal) is
already in the ovule of a fly:
the fore pole is recognizable with micropyle, structure of the hull which
allows the entry of the spermatozoon
The ovule comprises a chemical distribution
decreasing from the fore part to the rear (regarding the ARN messenger bicoïd)
and from the rear to the fore (regarding the ARN messenger nanos).