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分子别名（Synonym）
IL21,Za11,Interleukin-21
表达区间及表达系统（Source）
Human IL-21, premium grade (IL1-H5213) is expressed from human 293 cells (HEK293). It contains AA Gln 30 - Ser 162 (Accession # Q9HBE4-1).
Predicted N-terminus: Gln 30
It is produced under our rigorous quality control system that incorporates a comprehensive set of tests including sterility and endotoxin tests. Product performance is carefully validated and tested for compatibility for cell culture use or any other applications in the early preclinical stage.
GMP-L21H25 is the GMP version of this IL1-H5213. These two proteins display indistinguishable performance profiles, thereby ensuring a seamless transition for end users from early preclinical stag to later clinical phases.Request for sequence蛋白结构（Molecular Characterization）
This protein carries no "tag".
The protein has a calculated MW of 15.5 kDa. The protein migrates as 16 kDa±3 kDa when calibrated against Star Ribbon Pre-stained Protein Marker under reducing (R) condition (SDS-PAGE) due to glycosylation.
偶联（Conjugate）
Unconjugated
内毒素（Endotoxin）
Less than 0.01 EU per μg by the LAL method.
宿主蛋白残留（Host Cell Protein）
0.5 ng/µg of protein tested by ELISA.
宿主核酸残留（Host Cell DNA）
0.02 ng/μg of protein tested by qPCR.
无菌（Sterility）
Negative
支原体（Mycoplasma）
Negative.
纯度（Purity）
95% as determined by SDS-PAGE.
95% as determined by SEC-HPLC.
制剂（Formulation）
Lyophilized from 0.22 μm filtered solution in PBS, pH7.4 with trehalose as protectant.
Contact us for customized product form or formulation.
重构方法（Reconstitution）
Please see Certificate of Analysis for specific instructions.
For best performance, we strongly recommend you to follow the reconstitution protocol provided in the CoA.
存储（Storage）
For long term storage, the product should be stored at lyophilized state at -20°C or lower.
Please avoid repeated freeze-thaw cycles.
This product is stable after storage at:
- -20°C to -70°C for 12 months in lyophilized state;
- -70°C for 3 months under sterile conditions after reconstitution.
质量管理控制体系（QMS）
产品展示
电泳（SDS-PAGE）
Human IL-21, premium grade on SDS-PAGE under reducing (R) condition. The gel was stained with Coomassie Blue. The purity of the protein is greater than 95% (With Star Ribbon Pre-stained Protein Marker).
SEC-MALS
The purity of Human IL-21, premium grade (Cat. No. IL1-H5213) was greater than 95% as determined by SEC-HPLC.
活性（Bioactivity）-CELL BASE
Human IL-21, premium grade (Cat. No. IL1-H5213) stimulates secretion of IFN-γ by NK-92 human natural killer lymphoma cells stimulated with 10 ng/mL Human IL-15, premium grade (Cat. No. IL5-H4117). The specific activity of Human IL-21, premium grade (Cat. No. IL1-H5213) is > 1.00×10^5 U/mg (QC tested).
Protocol
稳定性（Stability）
The Cell based assay shows that Human IL-21 Protein, premium grade (Cat. No. IL1-H5213) is stable at 37°C for 48 hours.
The Cell based assay shows that Human IL-21 Protein, premium grade (Cat. No. IL1-H5213) is stable after freezing and thawing 3 times.
The Cell based assay shows batch-to-batch consistency between Acro's GMP and PG IL-21.
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