Activation of osteoclasts and their acidification-dependent resorption of bone is thought to maintain proper serum calcium levels. Here we show that osteoclast dysfunction alone does not generally affect calcium homeostasis. Indeed, mice deficient in Src, encoding a tyrosine kinase critical for osteoclast activity, show signs of osteopetrosis, but without… (More)
A set of restriction fragments cloned into phage lambda vectors has allowed us to locate a site necessary for full rpoBC expression. We find that these genes for the two large subunits of RNA polymerase and the genes, rplL and rplJ, for two ribosomal proteins, form a single operon.
Heart and vascular endothelial cells from human pluripotent stem cells are of interest for applications in cell therapy and cardiovascular disease. Differentiation protocols are now sufficiently refined that production of cardiomyocytes, endothelial-and smooth muscle cells is fairly efficient and reproducible. Genetically marked hESCs have been produced in… (More)
The program of protein synthesis was examined during sporulation in Bacillus subtilis as an index of the control of gene expression. At various stages of growth and spore formation, cells of B. subtilis were pulse-labeled with (35)S-methionine. Protein was extracted from the radioactively labeled bacteria and then subjected to high resolution… (More)