WORCESTER – Mackenzi R. McHugh sits at a horseshoe-shaped table and types on a laptop computer, nearly six hours into a shift that typically starts with a scientific meeting, continues with laboratory experiments and ends with data analysis. At 20 years old, the Worcester Polytechnic Institute biology major from Corinth, Maine, is working with other interns at Nemucore Medical Innovations Inc. on projects critical to the biotechnology company.