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

Answer: insulin


Question: Sentence1: Some pelycosaurs gave rise to a group of animals called therapsids. 
Sentence2: Like most other groups of synapsids, all pelycosaurs are now extinct.

Answer: pelycosaurs


Question: Sentence1: a mold spore has a negative impact on the respiratory system. 
Sentence2: Major components of the respiratory system are the lungs, trachea, nose, and the cell.

Answer:
respiratory