Done all A–1 Determine, with proof, the number of ordered triples (A1, A2, A3) of sets which have the property that (i) A1 ∪A2 ∪A3 = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, and (ii) A1 ∩A2 ∩A3 = ∅. Express your answer in the form 2357, where a, b, c, d are nonnegative integers. Solution: For each integer i from 1 to 10 you must put i in one of 6 sets: A1 ∩ A2 ∩ A3 or A1 ∩ A2 ∩ A3 or A1 ∩ A2 ∩ A3 or A1...

The von Willebrand factor (VWF) A2 crystal structure has revealed the presence of a rare vicinal disulfide bond between C1669 and C1670, predicted to influence domain unfolding required for proteolysis by ADAMTS13. We prepared VWF A2 domain fragments with (A2-VicCC, residues 1473-1670) and without the vicinal disulfide bond (A2-DeltaCC, residues 1473-1668). Compared with A2-DeltaCC, A2-VicCC ex...

Previous studies have shown that influenza virus-immune cytotoxic T lymphocytes can recognize virus in conjunction with self HLA-A2 antigens. Nevertheless, the virus-infected target cells from one HLA-A2-positive male donor (designated M7) could not be lysed by the virus-immune cytotoxic lymphocytes from any HLA-A2-matched unrelated donors. Although extensive serological analyses showed no diff...

BackgroundCOL4A1/A2 variants affecting the alpha 1 and 2 chains of type IV collagen are increasingly recognized as a cause fetal neonatal intracranial hemorrhage, porencephaly, schizencephaly. Fetal magnetic resonance imaging (MRI) findings in COL4A1/A2-related disorders not well characterized.MethodsThis is retrospective case series MRI eight patients with intraparenchymal hemorrhage (IPH) COL...

Previous studies have suggested that, in human melanoma, expression of HLA-A2 antigen is important for tumor cell recognition by autologous T-lymphocytes. Because of the recent demonstration that expression of HLA Class I antigens may be selectively lost in several human tumors, including melanoma, we derived pairs of tumor infiltrating lymphocytes (TIL) and melanoma cell lines from 4 human lym...

We have recently demonstrated the characterization of human tyrosinase TCR bearing h3T-A2 transgenic mouse model, which exhibits spontaneous autoimmune vitiligo and retinal dysfunction. The purpose of current study was to determine the role of T cells and IFN-γ in retina dysfunction and retinal ganglion cell (RGC) death using this model. RGC function was measured by pattern electroretinograms (...

von Willebrand factor (VWF) is a multimeric glycoprotein that critically supports platelet aggregation in hemostasis. Disordered VWF function causes both thrombotic and bleeding disorders, and genetic defects in VWF are responsible for von Willebrand’s disease (VWD), the most common inherited bleeding disorder in humans. Very large VWF multimers exhibit the greatest thrombogenic activity, which...

The two subunits of the human class I histocompatibility antigen (HLA)-A2 have been expressed at high levels (20-30 mg/liter) as insoluble aggregates in bacterial cells. The aggregates were dissolved in 8 M urea and then refolded to form an HLA-A2-peptide complex by removal of urea in the presence of an antigenic peptide. Two peptides from the matrix protein and nucleoprotein of influenza virus...

In response to blood vessel injury, hemostasis is initiated by platelet activation, advanced by thrombin generation, and tempered by fibrinolysis. The primary fibrinolytic protease, plasmin, can be activated either on a fibrin-containing thrombus or on cells. Annexin A2 (A2) heterotetramer (A2·p11)(2) is a key profibrinolytic complex that assembles plasminogen and tissue plasminogen activator a...

From an original A2 allele (colored aleurone), a mutable allele, a2-m-4 1629, that changes from a2 to A2 is described. Mutability is expressed as a very distinct pattern limited to the last cell division.-The mutability of a2-m-4 1629 is autonomously controlled by an En at the a2 locus. This En, inactive on standard a testers for En, is partially active on a2-m-1, an a2 tester for En, and expre...