1. Seth will undergo a will undergo a bone marrow transplant. 2 Yellow signifies a strong immune system. They want everyone to wear Seth's favorite color yellow. 3. SCID is a genetic condition that arises when the body is born without T cells - the most important white blood cells.

1.they get cancer 2.they found a a protein that tells the immature cell's genes what it needs to become. 3. the macrophage cells turn into cancer cells. They had turned into cancer cells.