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  • The expected molecular weight (MW) listed in the product datasheet is based solely on the size of the target protein’s amino acid sequence. It’s important to remember that many factors can affect the banding pattern of your western blot including: (1) the existence of a splice variant, (2) the quality of the loaded sample, (3) the protein extraction method, and (4) the protein transfer conditions. To achieve accurate results, you may need to systematically adjust the protein extraction method or the protein transfer conditions.

    • If the band’s MW is below the expected MW it could be due to a splice variant with a slightly different MW.
      • Heat the samples at 70°C for 10 min.
      • Increase the transfer time.
    • If the band’s MW is above the expected MW, it could be due to post-translational modifications.
    • In either event, you should use a blocking peptide as a negative control.

  • Some toxins and peptides are soluble in DMSO; you can find this information in the product specification section. For these products, prepare a concentrated stock solution first.

    1. Centrifuge vial (10,000 x g, 5 minutes) before adding solvent.
    2. Dissolve the lyophilized reagent in DMSO. We recommend keeping a concentrated stock solution at 1-10 mM (100-1000X higher than the final working concentration).
    3. Once the peptide is completely dissolved in DMSO, slowly dilute the peptide in pure water (or buffer) to the desired final working concentration.

    Note: We recommend that you maintain a DMSO concentration as low as possible. For cell assays, a final concentration of 0.1–0.5% DMSO (v/v) is considered acceptable. For other experiments, 5% DMSO (v/v) is recommended; adjust this according to your experimental requirements.

  • FAQ 3FAQ 3FAQ 3FAQ 3

1338 Results
  • α-Conotoxin MI
    Bioassay Tested
    α-Conotoxin MI
    A potent antagonist of muscle α1/β1/γ/δ nicotinic acetylcholine receptors (nAChRs)
    • Product Code: STC-370
    • Short Description: A potent antagonist of muscle α1/β1/γ/δ nicotinic acetylcholine receptors (nAChRs)
    • Applications: Electrophysiology
    • CAS No.: 83481-45-2
    • MW: 1493.7 Da
  • Charybdotoxin
    Bioassay Tested
    Charybdotoxin
    A potent broad-spectrum blocker of K+ channels, including KV1.2, KV1.3, KV1.6, KCa1.1 and KCa3.1 channels
    • Product Code: STC-325
    • Applications: Electrophysiology
    • CAS No.: 95751-30-7
    • MW: 4296 Da
  • α-Conotoxin EIIB
    Bioassay Tested
    α-Conotoxin EIIB
    A potent antagonist of muscle α1/β1/γ/δ nicotinic acetylcholine receptors (nAChRs)
    • Product Code: STC-230
    • Short Description: A potent antagonist of muscle α1/β1/γ/δ nicotinic acetylcholine receptors (nAChRs)
    • Applications: Electrophysiology
    • MW: 1754.5 Da
  • Ceratotoxin-2
    Bioassay Tested
    Ceratotoxin-2
    A potent blocker of central nervous system voltage-gated Na+ channels
    • Product Code: STC-100
    • Short Description: A potent blocker of central nervous system voltage-gated Na+ channels
    • Applications: Electrophysiology
    • MW: 4092.7 Da
  • BeKm-1
    Bioassay Tested
    BeKm-1
    A potent and selective blocker of hERG (KV11.1) potassium channels
    • Product Code: STB-470
    • Short Description: A potent and selective blocker of hERG (KV11.1) potassium channels
    • Applications: Electrophysiology
    • CAS No.: 524962-01-4
    • MW: 4092 Da
  • BDS-I
    Bioassay Tested
    BDS-I
    A blocker of KV potassium channels and a modulator that slows the inactivation of NaV sodium channels (particularly NaV1.7)
    • Product Code: STB-400
    • Short Description: A blocker of KV potassium channels and a modulator that slows the inactivation of NaV sodium channels (particularly NaV1.7)
    • Applications: Electrophysiology
    • CAS No.: 207621-38-3
    • MW: 4708 Da
  • BmKI Toxin
    Bioassay Tested
    BmKI Toxin
    A potent activator/modulator that delays the fast inactivation of NaV1.5, NaV1.6, and NaV1.3 voltage-gated sodium channels
    • Product Code: STB-100
    • Applications: Electrophysiology
    • MW: 7217 Da
  • ATX-II
    Bioassay Tested
    ATX-II
    A potent activator of voltage-gated sodium NaV channels that primarily targets cardiac NaV1.5 channels by delaying their fast inactivation
    • Product Code: STA-700
    • Short Description: A potent activator of voltage-gated sodium NaV channels that primarily targets cardiac NaV1.5 channels by delaying their fast inactivation
    • Applications: Electrophysiology
    • CAS No.: 60748-45-0
    • MW: 4935 Da
  • Agitoxin-2
    Bioassay Tested
    Agitoxin-2
    A potent blocker of KV1.3, KV1.1, and KV1.6 voltage-gated potassium channels
    • Product Code: STA-420
    • Applications: Electrophysiology
    • CAS No.: 168147-41-9
    • MW: 4091 Da
  • Agitoxin-3
    Bioassay Tested
    Agitoxin-3
    A potent blocker of KV1.3, KV1.1, and KV1.6 voltage-gated potassium channels
    • Product Code: STA-390
    • Applications: Electrophysiology
    • CAS No.: 155646-23-4
    • MW: 4101 Da
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