The term interstitial fluid is identified in base64 scheme by the sequence aW50ZXJzdGl0aWFsIGZsdWlk, while the MD5 signature is equal to ab8aafdd7b5b928e8fcdb94ce29bf8b5. The ASCII encoding of interstitial fluid in hexadecimal notation is 696e7465727374697469616c20666c756964.