That's a tough one and I am only guessing here. In my opinion, if you are going to take a snippet of another site, the more unique content you have on that page, the better. I'd be more concerned if you were just taking snippets of other sites and not adding any of your own original content to that page. That's not to say Google won't dock you a few points but it's good you plan to add your own info too.
It's hard for me to believe a few lines would cause too much of a penalty but one never knows. In the end, I still think you'll be OK. I also believe Google looks at the big picture. If the majority of your site is unique and you continue to get new backlinks on a regular basis, build original content, etc., using a few lines from another site won't hurt you as much.
Just my opinion though.
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