We describe procedures for determining cytosine and orotic acid in urine. We determine cytosine by cation-exchange analysis with either HCl or pH 5.2 buffer as eluent. Orotic acid is first separated by an anion-exchange separative procedure; after lyophilization, the product is subjected to "high-pressure" liquid chromatography for further separation and detection. We analyzed urine from normal...

The optimal approach to stem cell transplantation in children with immunodeficiency who lack a matched family donor is controversial. Unrelated donor stem cell transplantation gives equivalent outcome to mismatched family donor stem cell transplantation in severe combined immunodeficiency, whereas unrelated donors may be preferable in non-severe combined immunodeficiency children. However, unre...

The optimal approach to stem cell transplantation in children with immunodeficiency who lack a matched family donor is controversial. Unrelated donor stem cell transplant gives equivalent outcome to mismatched family donor stem cell transplant in Severe combined immunodeficiency whereas unrelated donors may be preferable in nonSevere combined immunodeficiency children. However, unrelated donor ...

bacillus calmette guerin (bcg) developed by albert calmette and camille guerin in france between 1908 and 1921 contained a live attenuated strain of mycobacterium bovis and was administered worldwide to prevent tuberculosis. bcg vaccination is also administered at birth to all the newborns in iran. disseminated bcg infection after bcg vaccination is rare. here in, we report 2 new cases of disse...

The ability to analyze T cell receptor (TCR) thymic repertoire shaping in humans by self and foreign ligands is hampered by the lack of suitable models. We recently documented that the mouse severe combined immunodeficiency (SCID)-human fetal liver/thymus model recapitulates the TCR V beta gene repertoire of human thymocytes. Here, we show that an exogenous superantigen, staphylococcal enteroto...

HIV infection has been associated with defective hematopoiesis since the earliest days of the HIV/AIDS epidemic. Generation of all hematopoietic lineages suffers in the face of infection. The mechanisms by which HIV impairs normal blood cell development remain unclear, and direct infection of intermediate hematopoietic progenitors has not been established as a source of HIV-associated hematopoi...

The opportunistic pathogen Pneumocystis carinii (Pc) is considered to be the leading cause of morbidity in patients with AIDS. It is important, therefore, to determine the immunological mechanisms of resistance to Pc. We have taken advantage of the lack of both T and B lymphocytes in severe combined immunodeficiency (scid) mice to determine the critical factors in resistance to spontaneously ac...