Changes

===Antigen Presentation===

===Antigen Presentation===

<p>Macrophages also act as '''antigen presenting cells''' taking antigens to lymph nodes to present to T cells. MHC II ([[Major Histocompatability Complexes|major histocompatibility complex]] II) proteins on their surface allow them to interact with helper T cells (CD4). Short peptide segments from foreign cells are presented with MHC II which activates the [[T cells|T cell]] as part of the nadaptive immune response.</p>

<p>Macrophages also act as '''antigen presenting cells''' taking antigens to lymph nodes to present to T cells. MHC II ([[Major Histocompatability Complexes|major histocompatibility complex]] II) proteins on their surface allow them to interact with helper T cells (CD4). Short peptide segments from foreign cells are presented with MHC II which activates the [[T cells|T cell]] as part of the adaptive immune response.</p>

===Immune System Regulation===

===Immune System Regulation===