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Description
Alexa Fluor® 647 Mouse Anti-Human CD21 Antibody (S-764-18)Product Specification Host Mouse Antigen CD21 Synonyms Complement receptor type 2, Cr2, Complement C3d receptor, Epstein Barr virus receptor (EBV receptor) Immunogen Recombinant Protein Location Cell membrane Accession P20023 Clone Number S 764 18 Antibody Type Mouse mAb Isotype IgG1,k Application FCM Reactivity Hu Purification Protein G Concentration 0. 02mg ml Conjugation Alexa Fluor 647 Physical Appearance Liquid Storage Buffer PBS, 0. 1% BSA, 0.
Product Specification
| Host | Mouse |
| Antigen | CD21 |
| Synonyms | Complement receptor type 2, Cr2, Complement C3d receptor, Epstein-Barr virus receptor (EBV receptor) |
| Immunogen | Recombinant Protein |
| Location | Cell membrane |
| Accession | P20023 |
| Clone Number | S-764-18 |
| Antibody Type | Mouse mAb |
| Isotype | IgG1,k |
| Application | FCM |
| Reactivity | Hu |
| Purification | Protein G |
| Concentration | 0.02mg/ml |
| Conjugation | Alexa Fluor® 647 |
| Physical Appearance | Liquid |
| Storage Buffer | PBS, 0.1% BSA, 0.01% Proclin 300 |
| Stability & Storage | 12 months from date of receipt / reconstitution, 2 to 8 °C as supplied. |
Dilution
| application | dilution | species |
| FCM | 5 μl per million cells in 100μl volume |
Background
CD21 is involved in the complement system. It binds to iC3b (inactive derivative of C3b), C3dg, or C3d.B cells express CD21 receptors on their surfaces, allowing the complement system to play a role in B-cell activation and maturation. CD21 interacts with CD19 and on mature B cells forms a complex with CD81 (TAPA-1). The CD21-CD19-CD81 complex is often called the B cell co-receptor complex, because CD21 binds to opsonized antigens through attached C3d (or iC3b or C3dg) when the B-cell receptor binds antigen. This results in the B cell having greatly enhanced response to the antigen. Epstein-Barr virus (EBV) can bind CD21, enabling EBV to enter and infect B cells.
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4.0 ★★★★★
Based on 2186 reviews
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Product Reviews
★★★★★ 5
Smells good and easy to apply
Style: Face Lotion - SPF 30, Size: 1.7 Fl Oz (Pack of 1)
Smells good and worked for both my 8 year old son and I
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 6, 2026
★★★★★ 5
It’s light weight and not greasy
Style: Face Lotion - SPF 30, Size: 1.7 Fl Oz (Pack of 1), Style: Face Lotion - SPF 30, Size: 1.7 Fl Oz (Pack of 1)
I absolutely love this sunscreen! It’s lightweight, not greasy, and blends perfectly into my skin without leaving any white cast. It keeps my skin protected and glowing all day, even in the hot sun. I’ve noticed my face feels softer and more hydrated since I started using it. Definitely one of my must-haves I’ll keep buying this one for sure!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 17, 2025
★★★★★ 5
A perfect product for me!
Style: Sunscreen Stick, Size: 1.5 Ounce (Pack of 1)
This product is so convenient for travel. I am very fair and used this exclusively on my face and neck on my recent trip to South Africa. No sunburn, no smell, easy on, no breakout on my face. A perfect product for me!
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Reviewed in the United States on May 2, 2026
★★★★★ 5
My Family's Favorite Sunscreen!
Style: Sunscreen Stick, Size: 1.5 Ounce (Pack of 1)
This is our go-to sunscreen and my family has not used any other brand since discovering it about 5 or 6 years ago. The scent is pleasant, light, and tropical. Application is quick and easy. It goes on clear (not white) and looks a little greasy at first, but that is actually a positive because it helps you quickly see spots you (or your child) missed. It soon absorbs cleanly and the oily feeling goes away after a few minutes. The sunscreen works really well. My family has very pale, sensitive skin with eczema and easily burns in the sun. It does not irritate our skin at all and provides great coverage. This stuff works very well for us on vacation in Florida and on Bahamas/Caribbean cruises. It fits easily in a small bag and doesn't take up much room. With it being a solid, there's no worry of leaking. I love that you can hand everyone a stick and they can do most of the application themselves. Then we turn around and get the hard to reach spots on each other. And all done with clean hands that aren't getting messy. I would be so sad if this sunscreen is ever discontinued. We have over a dozen sticks in our house/car/luggage at any given time.
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Reviewed in the United States on August 11, 2025
★★★★★ 5
No Fuss For Kids
Style: Sunscreen Stick, Size: 1.5 Ounce (Pack of 1)
Neutrogena Sunscreen Stick SPF 50 – A Summer Must-Have!
I absolutely love the Neutrogena Sunscreen Stick SPF 50 — it’s a staple in our summer routine. I always keep several on hand: one in the car, one in the stroller, and one in our beach bag. It’s just so convenient to have wherever we go!
What makes this sunscreen stick stand out is how easy it is to apply, especially on my kids’ faces. There’s no mess, no fuss, and no need to rub it in. I can quickly swipe it on even when they’re squirming or in the middle of playing. It goes on clear, feels lightweight, and doesn't leave a sticky or greasy residue.
This product gives me peace of mind knowing my kids are protected with broad-spectrum SPF 50, and I don’t have to wrestle them into a full sunscreen routine. Total win for busy parents!
Highly recommend for anyone looking for a quick, reliable, and kid-friendly sunscreen solution.
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Reviewed in the United States on June 23, 2025
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