atx-2 mRNA was detected throughout the larval and adult germline. (Kohara et al., the Nematode Expression Pattern Database, http://nematode.lab.nig.ac.jp.)
tbx-2 transcripts was detected starting at the 4E stage (~102 cell stage, 143 min after the 4-cell stage), and with mid-gastrula expression observed by in situ hybridization (Shin-i and Kohara, http://nematode.lab.nig.ac.jp/).