"Given that I'm approaching my graduation date and will be looking to break into the field with a great company like Gilead Sciences, your starting salary of 120,000 is exactly what I would expect. I feel that with experience and performance, I will work my up through the salary grade as your policies permit."

"First, I want you to know that my job search is not motivated by compensation, and my only expectation would be to be fairly compensated based on my years of experience in the field. If it helps for a starting point, my current salary is at 90,000 annually."

The best way to discuss your salary expectations is to use your current earnings as an example. You should surely be open and honest with your requirements. Research salary ranges for the job you are interviewing for so you know the salary matches your needs even before applying. Gilead Sciences includes salary ranges in their job postings on their career site, and a candidate's education and relevant experience are factored into where they fall within the pay range.