Conversation so far:
lymph node clusters are found in which region
These areas are the inguinal nodes in the groin, the axillary nodes in the armpit, and the cervical nodes in the neck.
how big are lymph nodes
Lymph nodes are small bean-shaped structures that are usually less than 2.5 cm in length.
what's the function of lymph nodes
Lymph nodes work like filters, or in our analogy security guards to filter bacteria, viruses, parasites, other foreign material that are brought to the nodes via lymphatic vessels.

Question: what is the structure of a node
Self-contained rewrite: what is the structure of a lymph node