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. 2021 Nov 16;1:777088. doi: 10.3389/fmmed.2021.777088

FIGURE 4.

FIGURE 4

Histone post-translational modifications are modulated by pH changes. HDACs are activated in response to acidic pH to reallocate positively charged ions (such as acetyl groups) and decrease intracellular pH. Removal of acetyl groups on histone tails can lead to heterochromatin formation and transcriptional silencing in those regions of DNA.