Does a Masters in Medical Sciences help?

[phillybabe]

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I will be applying to med school this summer. For next year, I have the option of either working towards a Masters in Medical Sciences (MMS) or working in a hospital. My undergrad GPA 3.5 and MCAT 30. I was wondering if the MMS will make me a better applicant or will the clinical work count more. Also, does having a MMS degree give you a leg up when applying for good residency programs? Any input will help.
Thanks