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]:  A 4 - week administration of GG root powder ( 5 and 10 gm % in diet ) to hypercholesterolaemic rats resulted in significant reduction in plasma , hepatic total lipids , cholesterol , triglycerides and plasma low - density lipoprotein and VLDL - cholesterol accompanied by significant increases in HDL - cholesterol levels .
[EX A]: plasma

[EX Q]:  In one of the few studies on dioxin - like compounds in which children were included , Eskenazi and coworkers [ 36 ] evaluated the relationship between serum TCDD concentrations and age at exposure of female residents of Seveso , Italy .
[EX A]: serum

[EX Q]:  Further evidence for the mediation of the relaxant response via the 5 - HT7 receptor is provided by the localization of messenger ribonucleic acid transcripts encoding the 5 - HT7 receptor in many blood vessels [ 67 ] .
[EX A]:
blood