A to F represent different domains of the ER. Numbers represent amino acids from amino to carboxy termini.
Reproduced with permission from: Ellis MJ, Hayes DF, Lippman ME. Treatment of metastatic breast cancer. In: Diseases of the Breast, 2nd ed, Harris JR (Ed), Lippincott Williams & Wilkins, Philadelphia 2000. Copyright © 2000 Lippincott Williams & Wilkins.
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