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		Prevent X-inactivation from occurring too early
		Directly promote genomic imprinting of autosomal genes
		Keep developmental genes poised for activation or repression
		Mark inactive alleles for permanent silencing
		Reflect errors in chromatin remodeling

		Prevent X-inactivation from occurring too early
		Directly promote genomic imprinting of autosomal genes
		Keep developmental genes poised for activation or repression
		Mark inactive alleles for permanent silencing
		Reflect errors in chromatin remodeling

During early embryonic development, bivalent chromatin marks are important because they: