You are a molecular biologist studying a defective human protein that is known to be the cause of a rare cancer. You isolate the suspected protein from a person with this cancer and compare it to the same protein in a person without the cancer. You discover that the protein isolated from the cancer patient is slightly smaller in size when compared to the protein from the unaffected patient. Furthermore, you discover that the protein from the cancer patient differs in almost every amino acid starting after the twenty-third amino acid. What is the likely explanation?

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