instruction:
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.
question:
 We plan to systematically investigate the effects of thawing and refreezing on RNA integrity , by deliberately thawing and freezing small samples of brain tissue over varying time intervals and temperatures .
answer:
samples


question:
 Data were collected by means of a questionnaire from a convenience sample of 509 predominantly well - educated , high - income , married women in the northeastern United States during the last trimester of pregnancy .
answer:
sample


question:
 Furthermore , when ACT is overexpressed in transgenic mice , an increased plaque load in the brains of these mice and impaired spatial learning is observed [ 134 , 135 ] .
answer:

plaque