What should I write for the professional summary in my resume?

[mjmjoa]

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I'm making a resume to give to professors that I will ask to write me a letter of recommendation. I have no idea what to put as a professional summary. Don't want to toot my own horn and I want to say something about pharmacy, but have no idea where to begin. It has to be short, so it's tough to write one. Any help from anyone that has written one of these before?