HMR-1 mosaic analysis. (A) PGC ingression in wild type (1st column, n=17), in embryos with low maternal and no zygotic hmr-1 expression (2nd column, progeny of hmr-1; hmr-1Ex mothers that do not inherit hmr-1Ex, n=16), in embryos with low maternal and high zygotic hmr-1 expression (3rd column, progeny of hmr-1; hmr-1Ex mothers that inherit hmr-1Ex, n=13), and in embryos with high maternal and no zygotic hmr-1 expression (4th column, progeny of hmr-1; hmr-1Ex; mex-5P:HMR-1-GFP::hmr-1UTR mothers that do not inherit hmr-1Ex, n=18). Asterisks indicate a significant difference in whether PGCs ingressed (**P<0.01, NS, not significant; Fisher's exact test). (B) PGC ingression in wild-type embryos fed on empty vector RNAi bacteria (1st column, n=10), hmr-1; hmr-1Ex hmr-1(RNAi) embryos (2nd column, n=14) and embryos from hmr-1; hmr-1P:HMR-1-ZF1-GFP::hmr-1UTR/ + mothers that did not inherit hmr-1P:HMR-1-ZF1-GFP::hmr-1UTR (3rd column, n=12) and therefore express HMR-1 only in PGCs. Asterisks indicate a significant difference in whether PGCs ingressed (***P<0.001, Fisher's exact test).