P21 (P021) — research reference, shipped from Colombia

Presentations and visible prices

The price above is the public value per vial. Availability and batch documentation are confirmed before the quotation is accepted.

A derived compound, not the original ciliary neurotrophic factor

P21 (P021)'s classification as a peptide compound derived from ciliary neurotrophic factor (CNTF) states a relationship of origin, not a shared identity: CNTF is a reference protein in the technical literature, and P21 is a peptide derivation built from that reference, with its own code and presentation in this catalog.

That same derivation logic appears in another reference in the neuromodulation category, PE-22-28, described in the general catalog as a heptapeptide derived from the sortilin propeptide. Both — P21 and PE-22-28 — share the naming pattern "derived from" a larger precursor, even though they come from different proteins and do not share a sequence.

A single 5 mg presentation: what to state in the quote

The catalog lists P21 (P021) in a single presentation, 5 mg vial, with a current listed price from US$276. The institutional request confirms that figure directly there, at the time of quoting.

That starting price does not depend on the chain length or on the classification as a CNTF derivative: it is the figure currently listed in the commercial catalog for this reference. The institutional quote must confirm it at the time of the request, without assuming it matches another reference in the same category.

Per-lot verification: the role of Janoshik Analytical

The relationship to ciliary neurotrophic factor does not replace the documentary verification of a specific P21 (P021) lot. That verification is the role of the certificate of analysis (COA) that Janoshik Analytical issues per lot: high-performance liquid chromatography (HPLC) for purity and mass spectrometry (MS) for identity.

The COA is handled on request and subject to documentary availability. This page does not publish a purity figure for P21, nor a CAS number, nor a molecular weight, nor the exact sequence derived from CNTF: if those data are not in the delivered lot's document, they remain visibly pending, not filled in by reference to the original protein. For a derived compound like this one, mass spectrometry is what confirms that the shipped material matches the stated derivation and not a different fragment of the same precursor.

Physical form and storage of the 5 mg vial

The 5 mg P21 (P021) vial corresponds to a powder presentation. The catalog's technical sheet states storage at 2–8 °C, protected from light, for this type of reference, a condition that should be confirmed against the specific documentation of the lot received before assigning custody space.

On receipt, the full reference name — P21 (P021), with both forms of the name — and the lot visible on the vial should be checked against the accepted quote; since this is a single presentation, that check avoids confusing it with another catalog reference before adding it to inventory.

Quote, shipping, and payment for a single presentation

Selecting P21 (P021) in the catalog does not generate an immediate charge. The order is recorded first with the 5 mg presentation and the current price; the commercial confirmation that follows fixes the total, the destination, and the payment method in writing. Shipping is calculated separately, with rates for Bogotá and for the rest of the country shown on the site's shipping information. Outside Colombia, this reference ships to 5 countries (Costa Rica, Ecuador, United States, Mexico and Puerto Rico), from US$57; the rate for each country is listed on the site's international shipping page.

Since P21 (P021) is offered in a single presentation, it is worth having the institutional quote spell out the full name, the unit price, and, if requested, the status of the COA precisely, before authorizing payment and linking the proof of payment to the order code.

P21 within the experimental neuromodulation category

The nootropic peptides and neuromodulators category groups, alongside P21 (P021), other references of diverse origin: DSIP, a nonapeptide with its own historical name, and Semax or Selank, derived from different hormonal fragments. Each reaches the category by a different structural route.

Compared with DSIP, which is its own sequence with no declared derivation relationship, P21 is distinguished by its explicit origin as a compound derived from CNTF. That is the structural comparison this page documents between the two references in this category, without extending it to any conclusion about their use.

Frequently asked questions about P21 (P021)