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).