Lymph nodes are part of lymphatic system. Lymph nodes perform two main function; one is to enhance the immunity by producing immune cells, and other is to absorb excess fluid that is continuously leaking from blood vessels. this fluid includes water, protein and other substances too. Lymph nodes are rich source of immune cells too.
Site-directed mutagenesis alters the amino acid sequence by introducing changes in the base sequence of DNA. This is done by either by substituting a single base, multiple bases and inserting or deleting a base.
