This model depicts a winter vrn-H1 allele at FR-H1/VRN-H1 and the Dicktoo-Nure allele at FR-H2, which harbors multiple copies of the CBF4B–CBF2A genomic region, boxed in red, green, and fuchsia. In the absence of VRN-H1 expression CBFs are expressed to high levels at normal growth...