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: 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 .

A: mucus
****
Q: Precautions against NH2 - terminal blocking during sample preparations are provided .

A: sample
****
Q: Subjects were excluded from analysis if they withdrew consent or if there was inadequate sample left for PCR testing .

A:
sample
****