Target Name: 
B-Lymphocyte Antigen CD19; B-Lymphocyte Surface Antigen B4; Differentiation Antigen CD19; T-Cell Surface Antigen Leu-12; CD19
Source: 
Human CD19 protein (NP_001171569.1) (Glu21-Lys291) with C-terminus Human IgG1 Fc tag and Avi tag is expressed in CHO cells. This protein was site-specifically labeled with Biotin by BirA ligase. The labeling efficiency is greater than 90% by gel shift assay.
Molecular Weight:
The 525 amino acid protein has a predicted molecular weight of 58.4kDa. The protein migrates at approximately 70-80kDa on SDS-PAGE with DTT-reduced condition.
Purity:
>95% based on SDS-PAGE under reducing condition
Formulation: 
1xPBS buffer, pH7.4, 0.22 µm filtered
Vial Size:
25µg, 100µg
Endotoxin Level:
Not Tested
Protein Concentration:
25µg size is bottled at 0.2mg/mL concentration. 100 µg size is bottled at lot-specific concentration.                                                                     
Storage and Handling: 
Quick spin the vial after receiving. An unopened vial can be stored at 2-8°C for 2 weeks or at -20°C and below for six months. The protein can be further diluted to 0.1 mg/mL with 0.22 µm filtered PBS buffer. This stock solution should be aliquoted and stored at ≤ -70°C to minimize the freeze/thaw cycles. Carrier proteins such as BSA needs to be added if further dilution is needed.