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AbstractWe examined the infiltration of acutely rejecting renal allografts (DALEW) by ED1+ and ED2+ macrophages and T lymphocytes at intervals of 24 h after transplantation. Donor and recipient macrophages were differentiated by MHC class II antigen expression in double-staining experiments with ED1. Proliferation was assayed after pulse-labelling with BrdU. We subdivided allograft infiltration into...
Expression of the proU operon of Escherichia coli is directly proportional to the osmolarity of the growth medium. The basal level of proU transcription is very low, but a large increase is triggered by a sudden rise in the external osmolarity. This increased expression is maintained for as long as the osmotic stimulus persists. We have capitalized upon these regulatory features of the proU operon...
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