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.
in most children with retinoblastoma the disease affects only one eye however one out of three children with retinoblastoma develops cancer in both eyes the most common first sign of retinoblastoma is a visible whiteness in the pupil called cat s eye reflex or leukocoriautations 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