Primary CTA: "I am a prospective..."
Rather than using four buttons in the nav, I made self-identification the primary action. "I am a prospective..." asks the visitor to finish the sentence, which costs one click and replaces a navigation problem with a question people can already answer about themselves. It also let the nav stay a single CTA instead of a menu of them, and it puts recruitment at the top of the hierarchy, where the lab's actual growth constraints are.