For the Anime episode: Erythroblasts and Myelocytes
AE3803 gets lost again and finds herself in her birthplace, the Red Bone marrow. She reminisces on being a young Erythroblast being trained by a Macrophage on how to be a Red Blood Cell. One day, while practicing to evacuate from bacteria, she got lost and was separated from the others. She got captured by a Pseudomonas Aeruginosa who intended to torture and kill her before moving on to other blood cells. A young Myelocyte came to her rescue, and although no match for the bacterium, bought enough time for Macrophage and a Neutrophil to arrive and kill the bacterium. She thanked the Myelocyte for helping her and they went their separate ways hoping to someday see each other again. In the present, she runs into U-1146. As he offers to guide her to her destination, she suspects the Myelocyte who saved her grew up to be U-1146.