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.

 The goal of this study was to determine whether immunosuppression plays a role in the level and duration of fecal shedding of Escherichia coli O157 .
fecal

 Data were collected by means of a questionnaire from a convenience sample of 509 predominantly well - educated , high - income , married women in the northeastern United States during the last trimester of pregnancy .
sample

 The glycosylation level of heparin - citrate precipitable fraction of serum which predominantly contained low density lipoprotein ( G - LDL ) also correlated well with GSP and LDL - cholesterol levels .

serum