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Write the schema to represent the entities below,including tables,the proper placement of the foreign key,and referential integrity constraint.
Methyl Groups
Methyl groups are chemical groups consisting of one carbon atom bonded to three hydrogen atoms (-CH3), often influencing the function and properties of organic molecules.
Histones
Proteins around which DNA is tightly coiled in chromosomes, playing a role in gene regulation.
Homeotic Genes
Genes that control the development layout of an organism's body plan, determining the identity of body parts.
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