Definition: A protein produced by B-lymphocytes that binds to a specific antigen.

Alright class, settle down, let’s take a peek, At something vital – it’s wonderfully sleek! We’re talking about antibodies , you see, A key defense for you and me. Now the dictionary gives us a clue, “A protein produced by B-lymphocytes true!” Let's break that down in a rhythmic flow, So the concept really starts to grow. B-Lymphocytes , those cells so bright, They listen closely, day and night. When a foreign thing – an antigen it’s called – Threatens our bodies, they stand up tall! These B-cells then build a special defense, A protein shield, with elegant sense. This protein is the antibody bright, It locks onto that antigen just right! Think of it like a key and a lock, you see, The antibody’s the key, perfectly free. It binds to the foe, preventing its spread, Protecting your health, safely instead! So, antibodies are proteins so grand, Responding quickly across the land – Or rather, within your body's grace, Keeping you healthy in this very place! Do you have any questions? Let’s discuss it with glee!