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文献和实验A chemokine-driven positive feedback loop organizes lymphoid follicles
, establishing a positive feedback loop that is likely to be important in follicle development and homeostasis. In germinal centres the feedback loop is overridden, with B-cell lymphotoxin 1 2 expression being induced by a mechanism
Use of the B.D. FACS or Calibur Flow Cytometers
antibodies may be used on a single negative control specimen. For multi-color flow, positive controls stained with a single antibody should also be employed to allow the setting of compensation (see below). Start machines: Fill the sheath fluid
b-Galactosidase Activity Assay
Marian Price-Carter, 9/7/00Day 1 : Start overnight cultures in assay medium.Negative control : cells lacking b -galactosidase, such as LT2; positive control : cells with high enzyme activity.Day 2 : Dilute cells 1/100 in fresh medium, grow
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