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.

Example Input:  Bacterial killing was normal in the two patients studied , and chemotaxis was diminished in response to zymosan - activated plasma and to high concentrations of chemotactic peptides in the patients studied .
Example Output: plasma

Example Input:  The injury to the airway can create binding sites for bacteria in the basement membrane of the bronchial tree and the stimulation of the secretion of mucus , which then stagnates and can create potential sites for bacterial adherence .
Example Output: mucus

Example Input:  The glycosylation level of heparin - citrate precipitable fraction of serum which predominantly contained low density lipoprotein ( G - LDL ) also correlated well with GSP and LDL - cholesterol levels .
Example Output:
serum

