Untitled - D Ank Unlimited

X-linked severe combined immunodeficiency (XSCID) 755 XYZ cell theory (historical)
be caused by an inability to combat Epstein–Barr virus,
leading to a fatal outcome.
X-linked severe combined immunodeficiency (XSCID)
A condition characterized by T cell development failure
during an early intrathymic stage, resulting in a lack of production
of mature T cells or T cell-dependent antibody. It is
a consequence of a defect in a gene that encodes portions of
receptors for different cytokines such as inherited mutations
in the common γ chains of the receptors for interleukin-2
(IL2), IL4, IL7, IL9, and IL15, resulting in impaired ability
to transmit signals from the receptor to intracellular proteins.
x-ray crystallography
A method to analyze protein structure at the atomic
level. Monochromatic X-rays from a rotating anode
x-ray generator or a synchrotron are directed to bombard
a crystallized protein. Although most x-rays pass
through the crystal, some are deflected after striking
atoms of the protein to produce a detectable and
reproducible pattern. Analysis of the diffraction reveals
information about the positions and orientations of the
atoms in the crystal.
XYZ cell theory (historical)
An earlier concept of antibody synthesis proposing (1) an
immunocompetent X cell that had not participated previously
in a specific immune response, (2) a Y cell activated
immunologically by X cell interaction with antigen, and
(3) a Z cell that synthesized antibodies following second
contact with antigen.
X