Which is the first signal in the activation of a T cell?
A) the fusion of antigenic peptide fragments and major histocompatibility complex (MHC) proteins
B) a T cell receptor recognizing an antigen using the CD4 protein
C) a T cell undergoing clonal selection
D) the exocytosis of the antigen-major histocompatibility complex (MHC) protein compound into the plasma membrane
E) a T cell receptor recognizing a peptide fragment of a self-protein

Question

Quizplus · Accepted Answer

The first signal in T cell activation is the recognition of an antigen by the T cell receptor (TCR) using the CD4 or CD8 protein, depending on the type of T cell.

Which Is the First Signal in the Activation of a T