The term gastroenterologist is identified in base64 scheme by the sequence Z2FzdHJvZW50ZXJvbG9naXN0, while the MD5 signature is equal to aa57c5db886515bd77a820bb6b3101a9. The ASCII encoding of gastroenterologist in hexadecimal notation is 67617374726f656e7465726f6c6f67697374.