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Fig. 6. In-situ hybridization patterns of example Group I and Group IV
genes. The head of the animal is marked by an asterisk. (A-D)
Autosomal Group I genes initiate detectable expression in the medial germline,
while X-linked genes are more proximal. Arrows mark medial germline and onset
of expression. (E-H) Group IV genes generally show broad expression,
including distal and proximal germline. In-situ data courtesy of Y. Kohara
(http://nematode.lab.nig.ac.jp).