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.

Q:  In contrast , the 3 cases of metastatic cancer of the GB had no blood flow signal in the wall of the GB .

A: blood
****
Q:  Data from this study suggest that there may be a time - dependent relationship between dexamethasone immunosuppression and the fecal concentration of E . coli O157 but that transient immunosuppression does not appear to prolong shedding of E . coli O157 .

A: fecal
****
Q:  Measurement of serum glycosylated proteins and glycosylated low density lipoprotein fraction in diabetes mellitus .

A:
serum
****