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:  No blood flow signal was observed in the masses of 13 cases ( 3 of metastatic adenocarcinoma , 5 of adenoma , 5 of polypus ) .

A: blood
****
Q:  In a 1 . 5 ml microcentrifuge tube , plasmid ( 1 microg / microl ) and siRNA were mixed with growth medium without fetal calf serum ( FCS ) , 0 . 5 microl 1 . 5 M sucrose and 3 microl X - tremeGENE per microgram nucleic acid to a final volume of 22 . 5 microl .

A: serum
****
Q:  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 .

A:
blood
****