Given graphs H1, . . . ,Hk, let f(H1, . . . ,Hk) be the minimum order of a graph G such that for each i, the induced copies of Hi in G cover V (G). We prove constructively that f(H1,H2) ≤ 2(n(H1) + n(H2) − 2); equality holds when H1 = H2 = Kn. We prove that f(H1,Kn) = n + 2 √ δ(H1)n + O(1) as n → ∞. We also determine f(K1,m−1,Kn) exactly.

An immunoinhibitory role of B7 homologue 1 (B7-H1) expressed by non-T cells has been established; however, the function of B7-H1 expressed by T cells is not clear. Peak expression of B7-H1 on Ag-primed CD8 T cells was observed during the contraction phase of an immune response. Unexpectedly, B7-H1 blockade at this stage reduced the numbers of effector CD8 T cells, suggesting B7-H1 blocking Ab m...

nm23-H1, a nucleoside diphosphate kinase (NDPK), enhances drug sensitivity and has antimetastatic activity, whereas focal adhesion kinase (FAK) is closely associated with cell migration and tumour spreading. The relationship between these two proteins, however, is not well elucidated. In this study, we investigate their correlation in patients with non-small cell lung cancer (NSCLC). Expression...

B7-H1 is a co-inhibitory molecule belonging to the B7 family. The B7-H1 protein is only expressed on macrophage lineage of cells in normal tissues, but is overexpressed in most types of tumor. The aberrant expression of cell surface B7-H1 on cancer cells is generally associated with high-risk prognostic factors. The tumor-associated B7-H1 increases apoptosis of antigen-specific T cells through ...

This work was aimed at comparing distribution of isoforms for polymorphic histone H1 variants H1.b and H1.z and variably abundant histone H1.d subtype between quail (Coturnix japonica) population selected for a high egg yolk cholesterol content and the control birds. The isoforms of histone H1.b (H1.b1, H1.b2) and histone H1.z (H1.z1, H1.z2) differed in their apparent molecular weights judging ...

We previously compared the structure and motility suppressive capacity of nm23-H1 by transfection of wild type and site-directed mutant forms into breast carcinoma cells. Wild type nm23-H1 and an nm23-H1(S44A) (serine 44 to alanine) mutant suppressed motility, whereas the nm23-H1(P96S), nm23-H1(S120G), and to a lesser extent, nm23-H1(S120A) mutant forms failed to do so. In the present study wil...

BACKGROUND AND OBJECTIVE The investigation concerning the B7-H1 expression in colorectal cancer cells is at an early stage. It is unclear whether B7-H1 expression may have diagnostic or prognostic value in colorectal carcinoma. Additionally, how B7-H1 is associated with the clinical features of colorectal carcinoma is not known. In order to investigate the relationship between B7-H1 and colorec...

Lateral mobility studies comparing native and mutated membrane proteins, combined with treatments that alter clathrin lattice structure, can measure membrane protein-coated pit interactions in intact cells (Fire, E., Zwart, D., Roth, M. G., and Henis, Y. I. (1991) J. Cell Biol. 115, 1585-1594). We applied this approach to study the interactions of the H1 and H2 human asialoglycoprotein receptor...

Condensed and late-replicating interphase chromatin in the Dipertan insect Chironomus contains a divergent type of histone H1 with an inserted KAP-KAP repeat that is conserved in single H1 variants of Caenorhabditis elegans and Volvox carteri. H1 peptides comprising the insertion interact specifically with DNA. The Chironomid Glyptotendipes exhibits a corresponding correlation between the prese...