成人免费网站在线 I 亚洲经典视频在线观看 I 亚洲91精品 I 人人91 I 亚洲黄色短视频 I 国产成人无码av I 女性高潮视频 I 色女综合 I 性欧美69 I 欧美国产日韩在线观看成人 I 亚洲精品第五页 I 欧美另类videosbestsex日本 I 色综合激情网 I 冲田杏梨av I 男女操网站 I 日韩久久一区二区三区 I 91在线视频精品 I 北条麻妃在线一区 I 成色视频 I 亚洲熟女乱综合一区二区 I 欧亚一区二区三区 I 青青在线视频一区二区三区 I 精品国产一区二区亚洲人成毛片 I 成人久久18免费网站漫画 I 国产69精品久久久久777 I 亚洲色大网站www永久网站 I 国产欧美一区二区三区不卡高清 I 国产影片中文字幕 I 性感美女福利视频网站 I 精品久久久久久久久妇女 I 久久成人网站亚洲综合 I 天天操天天天 I 亚洲高清最新av网站 I 奇米影视亚洲狠狠色 I 丝袜美腿美女一区二区 I 欧美日韩一区二区三区在线观看免费 I 日本高清色www在线安全 I 久久人人做人人妻人人玩精品hd I 午夜少妇在线观看视频

miltenyi美天旎Human IL-2 IS細胞因子，miltenyi美天旎Human IL-2 IS細胞因子，

IL-2 IS stands for interleukin 2 "Improved Sequence", also termed aldesleukin, and is a variant of IL-2 with a serine to cysteine substitution. Human IL-2 IS is a recombinant protein optimized for use in cell culture, differentiation studies, and functional assays, and possesses the same properties as naturally occurring IL-2.

Background information

IL-2, a potent lymphoid cell growth factor, is a typical four α-helix bundle cytokine. It is produced by activated T cells, especially the CD4+ T helper cell population. It plays an important role in both the activation and maintenance of immune responses and in lymphocyte development. IL-2 promotes proliferation and differentiation of T cells, NK cells and B cells and is involved in the elimination of self-reactive T cells. IL-2 signals through a receptor complex consisting of IL-2 receptor α-chain (CD25), β- chain, and common γ-chain. The latter two are also used for IL-15 signaling.

Biological activity

Proliferation of CTLL-2 cells (NIBSC 86/504)

research grade: ≥ 3×106 IU/mg

premium grade: ≥ 5×106 IU/mg

Quality description

Research-grade cytokines are suitable for a wide variety of cell culture applications. They are sterile-filtered prior to lyophilization. Generally, endotoxin levels are <0.1 ng/μg (<1 EU/μg), and purities are >95%. The biological activity is tested in appropriate bioassays.

Premium-grade cytokines offer the convenience of high and well-defined biological activities and allow exact unit dosing for demanding applications. The biological activity is determined after lyophilization and reconstitution, and normalized to WHO/NIBSC standards whenever available. In general, endotoxin levels are <0.01 ng/μg (<0.1 EU/μg), and purities are >97%. Lot-specific certificates of analysis are available on request (macstec@miltenyibiotec.de).