Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.

Q: Sentence1: Viruses are parasites of cells. 
Sentence2: Populations of viruses do not grow through division because they are parasites.

A: are
****
Q: Sentence1: For example, insulin is a protein hormone. 
Sentence2: Insulin is produced in a part of the cell called the ribosome.

A: insulin
****
Q: Sentence1: Cells have multiple repair mechanisms to fix mutations in DNA. 
Sentence2: Cells have multiple repair mechanisms to fix damage to DNA.

A:
Cells
****