The immune system is able to distinguish self from nonself because self cells contain molecules encoded by a group of genes.These genes are referred to as the major histocompatibility complex (MHC).

• 在现代医学科学革命和技术革命浪潮中，以基础医学和临床医学新成果为先导的技术迅速崛起，改变了整个医学的形象，医学呈现了一系列新的发展趋势。