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: Antigens are proteins foreign to the body. 
Sentence2: antigens are proteins.
[A]: proteins


[Q]: Sentence1: soil is formed by weathering. 
Sentence2: Something described as loamy is formed by weathering.
[A]: formed


[Q]: Sentence1: Ejaculation allows males to reproduce. 
Sentence2: propelling sperm from the epididymes allows males to reproduce.
[A]:
allows