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:  Our data suggest that yolk - DNA arises by the adventitious uptake of DNA present in the maternal serum by vitellogenic oocytes .

A: serum
****
Q:  We also established the rate assay for urinary DPPIV activity using Gly - Pro - DBAP .

A: urinary
****
Q:  The results were analyzed using statistical methods and a significant decrease in blood flow , Vmax , was found in all investigated arteries .

A:
blood
****