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: Most genes contain the instructions for a single protein. 
Sentence2: Most genes contain the instructions for protein destinations.

A: Most
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Q: Sentence1: Cells are the microscopic building blocks of organisms. 
Sentence2: proteins are the building blocks of organisms.

A: organisms
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Q: Sentence1: if a thermal conductor is exposed to a source of heat then that conductor may become hot. 
Sentence2: Radiant heat is the way the sun heats the planet.

A:
heat
****