Join us in celebrating the strength of partnerships—whether in life or in the lab.
Today through Feb. 28th, buy any 1 of the products listed below in our duos, and get another 15% off*!
Use code 'TWINSDAY' at checkout.
Duo 1: The Peptide Backbones 🏠
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Duo 2: The Sequencing Masters 🧬
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These two excel in sequences where hydrophobic interactions are key. Phenylalanine’s aromatic ring can enable π–π stacking or enhance binding sites, while Leucine’s branched side chain offers robust core stability.
Used together, they lay down a strong hydrophobic foundation in peptides and proteins, facilitating predictable folding and functional performance.
Duo 3: The Gatekeepers 🗝️

Designed for advanced, cationic-rich peptide segments, this duo is all about targeted side-chain protection. Lysine’s Boc group allows selective reactivity and simplified deprotection, while Arg’s PMBF-sulfonyl group offers a high level of specificity and purity.
Duo 4: The Armor 🦾
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When synthesis calls for protective strategies on hydroxyl-containing amino acids, look to this t-Butyl-tag team. Serine and Threonine—each capped with a tert-butyl group—provide robust side-chain shielding during elongation and easily transition to free hydroxyl form when needed.
It’s a reliable, versatile pairing for building stable, functional peptides.
*Promo Terms and Conditions: Offer valid online only through February 28th, 2025, 11:59 PM CT, while supplies last. Promo reusable. Cannot combine with other discounts. Terms and conditions of sale apply. Mix and match from the following products only (CAT #): 02369, 02416, 02443, 00145, 00493, 01964, 02454, 02460.