Amino Acid Sequence|Binding Sites|Chlorine|Databases, Protein|Drug Interactions|Endocrine Glands|Endocrine System|Estrogen Receptor alpha|Hormones|Humans|Hydrogen Bonding|Ligands|Models, Molecular|Molecular Sequence Data|Protein Binding|Protein Conformation|Protein Structure, Tertiary|Receptors, Steroid|Sequence Homology, Amino Acid|Software|Steroids