【多选题】CTLs are cytotoxic against tumor cells and host cells infected with intracellular pathogens. These cells usually express ____ and destroy infected cells in an antigen-specific manner that is dependent...
【判断题】Female mammals that are heterozygous for an X-linked gene have patches of cells that express one allele and patches of cells that express the other.
【单选题】In ______, Theodore Friedmann and Richard Roblin published an important paper in Science [175(4025): 949-955] describing the use of gene therapy. Friedmann and Roblin described how they induced mammal...