(Solved): Some breast cancer patients taking Herceptin eventually develop resistance to the drug. Here, a ...

Some breast cancer patients taking Herceptin eventually develop resistance to the drug. Here, a Phenylalanine on the surface of the HER2 receptor on breast cancer cells has been changed to another amino acid so that it cannot interact with a Tryptophan on Herceptin. Phenylanine has most likely been changed to.... Some breast cancer patients taking Herceptin eventually develop resistance to the drug. Here, a Phenylalanine on the surface of the HER2 receptor on breast cancer cells has been changed to another amino acid so that it cannot interact with a Tryptophan on Herceptin. Phenylanine has most likely been changed to.... Alanine. Leucine. Aspartic acid. Valine.