Definition: 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.
Input: Sentence1: P16 is a regulator of the cell division cycle. 
Sentence2: Cancer is a disease that occurs when genes like P16 stop functioning properly.

P16