HY5 is one of the most thoroughly characterised components of the light signalling pathway and, aside from its role in promoting photomorphogenesis, has been found to affect the circadian clock, temperature responses, chlorophyll and anthocyanin biosynthesis as well as nutrient uptake \cite{Gangappa2016}. In agreement with its multifaceted roles, we find genes related to light signalling (PHYTOCHROME INTERACTING FACTOR 4/PIF4, EARLY LIGHT INDUCIBLE PROTEIN 1/ELIP1, BBX16), multiple heat shock genes, the core circadian clock gene TIMING OF CAB EXPRESSION 1 (TOC1) and several UDP glucosyltransferase genes involved in flavonoid metabolism among its predicted targets (Fig. 3C). In contrast to HY5, BBX31 represents a negative regulator of photomorphogenesis \cite{Heng2019}. Its targets do not show strong enrichment for specific biological processes, but include the related BBX transcription factors BBX18 and BBX30 as well as HY5 itself (Fig. 3D). It has previously been shown that HY5 represses BBX31 transcription \cite{Heng2019}, but based on our data a reciprocal regulation of HY5 by BBX31 may occur as well,