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.

[EX Q]:  Portal venous blood draining into the liver from the intra - abdominal abscess had increased levels of TNF - alpha , IL - 1beta , and IL - 6 in both sterile and septic groups compared with a control normal animal group .
[EX A]: blood

[EX Q]:  For the 30 cases of benign lesions of the GB , only in 12 cases was a low velocity blood flow signal found .
[EX A]: blood

[EX Q]:  As expected , serum PCBs , specifically PCB 118 , were strongly associated with both sum of dioxin - like compounds and sum of dioxin TEQs .
[EX A]:
serum