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ABarpa
AB
D
MS
C
MS
MS
Pu
E
D
C
Hypo-
dermis
X
Hypodermis
D
X
C
E
Pu
MS
MS
MS
C
D
Ring
ganglia
Ring
ganglia
Ventral
indentation
Dorsal
hypodermis
Lateral hypodermis
and PNS
Mesoderm
Endoderm
Ventral hypodermis
and CNS
CNS
Ovary
Intestine
Hypodermis
Pharanx
Vulva
Sensory
neuron
Mature worm
Endoderm
Motorneuron,
ventral nerve cord
A B
FIGURE 1.5 The next phase of development of the C. elegans worm also highlights the shared lineages of
hypodermis and neurons. A. During gastrulation, the MS, E, C, and D blastomeres all migrate into the inte-
rior of the embryo, while the progeny of the AB blastomeres spread out over the external surface. Once the
embryo starts to take form, sections through the embryo show the relationships of the cells. The neurons are
primarily derived from the ventrolateral surface, through the divisions of the AB progeny cells. As these cells
are generated, they migrate into the interior and form the nerve rings. B. A typical lineage is also shown. The
Abarpa blastomeres undergo five rounds of division, to generate 9 neurons and 10 hypodermal cells. Neural
lineages are shown in red.
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