In the absence of a functional phyl gene product, ommatidia are usually missing three photoreceptor cells: two outer cells with large rhabdomeres (the light-sensitive apparatus of the photoreceptor), and one inner cell with a small rhabdomere.
(ommatidia; are missing; three photoreceptor cells; L:In the absence of a functional phyl gene product; T:usually)
ommatidia
are missing
three photoreceptor cells L:In the absence of a functional phyl gene product T:usually