Part 1. Definition
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.
Part 2. Example
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.
Answer: serum
Explanation: Serum is a substance of the organism and needs to be tagged.
Part 3. Exercise
 Chronic rubella viremia has been detected in peripheral blood mononuclear cell ( MNC ) populations in five of the six women up to six years after vaccination .
Answer:
blood