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Axygen® Universal Tips are designed to fit a wide variety of single and multi-channel pipettors, compatible with most popular brands of pipettors. These polypropylene tips are nonpyrogenic and certified to be RNase-/DNase-free. They are available in Maxymum Recovery, beveled, Eppendorf-style, nonsterile, sterile, non-filtered, and other features for specialized applications. Flexible walls and a series of internal sealing rings ensure a secure fit with less force required to load and eject.
These polypropylene tips are nonpyrogenic and certified to be RNase-/DNase-free.
Nonpyrogenic
Beveled
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文献和实验1. T、B细胞相互作用的过程T细胞为Th2亚群，而B细胞既是Th细胞辅助的对象，又是T细胞活化的APC。这一相互合作包括一系列过程：①抗原以其B表位(绿色)与BCR结合传递B细胞活化的第一信号，使其C1340与细胞因子受体的表达增加，并使B细胞加工提呈抗原和表达少量D7分子；②B细胞作为APC将带有T表位(红色)的抗原肽提呈给CD4T细胞，供T细胞识别；③初步活化的T细胞表达CD40L等，与B细胞表面CD40结合成为B细胞活化的第二信号；④活化B细胞表达B7分子与CD28结合为T细胞提供第二
with 5 ml of PBS and add to gradient. Centrifuge at 300 g for 40 minutes, room temperature. Collect the B cells at the interface. Wash 3 times with PBS. Suspend the SRBC-T cell pellet. Centrifuge at 300 d for 10 minutes. Aspirate all of the supe
Separation and Maintenance of Primary T and B Lymphocytes
Two distinct populations of lymphocytes have been identified: T lymphocytes, which are thymus-dependent, and B cells, first observed in the Bursa Fabricus of birds. Mammals do not have an equivalent structure, and there are varying opinions
