You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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.

Antisperm antibodies were assessed in the serum samples of 73 men unable to ejaculate naturally and on the sperm cells of 13 of these men.
Solution: serum
Why? Serum is a substance of the organism and needs to be tagged.

New input:  The normo - cholesterolaemic animals when fed with GG root powder at 10 gm % level , registered a significant decline in plasma lipid profiles and an increase in HDL - cholesterol content .
Solution:
plasma