Antibodies are produced by B cells, a type of white blood cell that matures in the bone marrow.

Here's a breakdown:

1. Bone Marrow: B cells are initially produced in the bone marrow, a spongy tissue found inside some of your bones.

2. Lymphatic System: B cells then travel to the lymphatic system, a network of tissues and organs that help to filter waste and fight infections.

3. Activation: When a B cell encounters an antigen (a foreign substance like a virus or bacteria), it becomes activated.

4. Plasma Cells: Activated B cells differentiate into plasma cells, which are specialized antibody-producing cells.

5. Antibody Production: Plasma cells release antibodies into the bloodstream, where they can bind to and neutralize the antigen.

So, while antibodies are produced by B cells, the entire process starts in the bone marrow and involves a complex interaction between the immune system's different components.