Fig. 6. Development of the M-lineage. (A-T) Wild-type (WT) and
los mutant Drosophila embryos of the indicated ages were
stained with antibodies to Mid and En (A-H), Mid and Eve (I-P), or Mid+Zfh1
(Q-T). Anterior is up; midline is marked by vertical line(s). Arrowhead,
M-GMC; large arrow and M, M-neuron; small arrow and s, M-sib; white asterisks
in N indicate another Mid-positive neuron and its smaller sibling cell.
(U) The developmental timing of the M-lineage.