does vitamin c prevent chapped lips are not always “just dryness.” Persistent cracked lips may result from dehydration, lip licking, allergic reactions, environmental exposure, or even nutritional deficiencies in some cases. Understanding the cause is key—because Which Vitamin Deficiency Causes Dry

islandica , while the Baltic Sea and White sea populations have a maximum lifespan of 30-50 years (Gruber et al., 2015)

10.1016/j.psj.2022.102031 Poult Sci

Miyata et al., 2019)

For example, acetylation at histone H3K9 has been observed to modulate the gene expression of key enzymes in the flavonoid and abscisic acid pathways, thereby enhancing the drought resistance of sea buckthorn ( Hippophae rhamnoides ) ( Petunia hybrida , histone acetylation at the promoter region of the CHS gene (encoding chalcone synthase) enhances its expression, thereby increasing chalcone production ( Matthiola incana , histone methylation at the DFR gene, which encodes dihydroflavonol reductase, results in higher expression levels and increased anthocyanin accumulation (Winkel-Shirley, 2001)