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Fig. 7. ß
-dependent cell-surface expression of 
PS3 indicates that
ß makes a heterodimer with PS3. Embryos were labelled with
antibodies against the PS2 subunit (green) and the PS3 subunit
(magenta). (A) The PS2 subunit is expressed in the somatic and visceral
muscles, and localizes to sites of attachment between adjacent muscles in
wild-type stage 16 embryos (arrows). The PS3 subunit is expressed in
the midgut endoderm and is localized cortically (A'). (B) In stage 16
embryos lacking both maternal and zygotic ßPS, PS2 failed to be
transported to the surface of muscle cells and remained trapped in the
endoplasmic reticulum (arrow). However, the plasma membrane expression of
PS3 was retained in midgut endodermal cells (B'). (C) In the
absence of both ß and zygotic ßPS, the PS3 subunit failed
to be transported to the surface of endodermal cells (C').
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