Where is the secretory component of immunoglobulin A (IgA) produced?

Explanation

The secretory piece of IgA is generated by the epithelial cells lining mucosal surfaces, which facilitates the transport of IgA across the epithelium to secretions. T-cells and B-cells produce immune components but not the secretory piece. Lymph nodes and bone marrow are not responsible for synthesizing this component.