Detection of endogenous olvas
(A–D, G, and H) and
GFP (E and F) transcripts
by whole-mount in situ hybridization (white arrowheads).
(A) Stage 16, olvas-expressing cells
decrease in number and converge on the embryonic shield. Stages 18
(B) and 21 (C),
olvas-expressing cells align bilaterally along the
trunk. (D) Stage 27, two clumps form at the
ventrolateral region of the intestine. Stages 21 (E) and
27 (F) are also shown. Black arrows in C,
G (stage 32, lateral view), and H (stage
32, a view from the tail) indicate cells expressing
endogenous olvas transcripts in ectopic
locations.