<h3><u>Mark Everett Sloan, M.D., F.A.C.S. is a fictional character from ABC's medical drama television series Grey's Anatomy, portrayed by Eric Dane. Created by showrunner Shonda Rhimes, the character was introduced in season two as Derek Shepherd's best friend. </u></h3>
Mark Everett Sloan, M.D., F.A.C.S. is a fictional character from ABC's medical drama television series Grey's Anatomy, portrayed by Eric Dane. ... Both he and Lexie sustained fatal injuries during an aviation accident in the eighth-season finale, and Seattle Grace Mercy West is later renamed Grey Sloan Memorial Hospital.
They help to prevent the disease from occurring. The immune system becomes familiar with the pathogen and learns how to fight it. Its the same process with vaccines
