duete; see due, ty 2 ]. syn: duty, obligation refer to something a person feels bound to do. A duty often applies to what a person performs in fulfillment of the permanent dictates of conscience, piety, right, or law: one's duty to tell the truth; a parent's duty to raise children properly.
Mutations in the RB1 gene are responsible for most cases of retinoblastoma. RB1 is a tumor suppressor gene, which means that it normally regulates cell growth and keeps cells from dividing too rapidly or in an uncontrolled way.
âChances are the white-eye reflex is not a sign of retinoblastoma,â she said. âItâs the one everyone hears about because itâs the worst. But it isnât nearly the most common cause for the reflex.â. Up there with the most common causes of leukocoria, she added, are bad photography angles.