CG methylation is efficiently maintained in female sex cells. (A and B) Box plots show CG methylation for individual CG sites with methylation greater than 50% and located within TEs. (A) Only sites outside DMRs in the CG context between wild-type and dme mutant Arabidopsis endosperm (10) and with at least 10 informative sequenced cytosines are included. Published data are from the following: *, ref. 27; #, ref. 25; +, ref. 28; $, ref. 26. (B) Only sites outside rice embryo–endosperm CG DMRs (12) and with at least 20 informative sequenced cytosines are included. Published data are from the following: §, ref. 30; ++, ref. 35.