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]:  We also established the rate assay for urinary DPPIV activity using Gly - Pro - DBAP .
[A]: urinary


[Q]:  Residential proximity to the plant and younger age ( up to 13 years old ) were the strongest predictors of an individual ' s serum 2 , 3 , 7 , 8 - TCDD level .
[A]: serum


[Q]:  The placenta biopsy sample was collected at a depth of 1 cm and at a distance of 8 cm from the edge of the placenta , with the maternal side facing upward .
[A]:
sample