Table 1.

Recovery of DNA methylation after a 4-week vernalization treatment

Days at 21°C post-cold treatment	Methylation level
	Unvernalized	Vernalized
0	83.3 ± 1.6	74.0 ± 2.5
4	80.3 ± 2.4	77.7 ± 3.0
7	86.7 ± 3.3	83.7 ± 3.2
14	102.1 ± 3.6	95.2 ± 3.5
21	95.8 ± 1.8	98.0 ± 3.8

Methylation level is expressed as % ± SE, relative to a standard, isolated from mature leaves. Methylation estimates were done at least three times for each sample. The difference in methylation between cold-treated and untreated seedlings was replicated in six independent experiments; the recovery of methylation was observed in two independent experiments.