Instructions: In this task, you are given a sentence. You are expected to write the name of the organism substances in the body mentioned in the input. Although there might be several correct answers, you need to write one of them.
Input:  Increased levels of these cytokines were also found in suprahepatic inferior vena caval blood , but were correlated with the higher portal vein levels , suggesting a gradient from abscess wall to portal vein into the systemic circulation via the liver .
Output:
blood