Teacher: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.
Teacher: Now, understand the problem? Solve this instance: 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 .
Student:
samples