The term gastrointestinal system is identified in base64 scheme by the sequence Z2FzdHJvaW50ZXN0aW5hbCBzeXN0ZW0=, while the MD5 signature is equal to b4abb2aa546a11105c6aa72bc16af98c. The ASCII encoding of gastrointestinal system in hexadecimal notation is 67617374726f696e74657374696e616c2073797374656d.