— Reading by Pathway —
Articles organized by research axis.
Every Molecular Examiner article maps to one of three peptide-research axes — metabolic, GH-axis, or tissue repair — plus the cross-cutting methodology notes that underwrite all three. The clusters below match the structure of the broader literature.
Axis 01 — Metabolic / Incretin
GLP-1, GIP, and amylin receptors. The most-studied metabolic pathway pair in modern peptide pharmacology research.
Articles in this axis cover the dual-incretin / amylin literature — tirzepatide as a dual GLP-1/GIP agonist, semaglutide as the single-receptor comparison, cagrilintide as the amylin partner. Together they anchor the chemistry the metabolic-research field is built on.
4 notes in this axis
Understanding the GLP-1 Receptor Family
GLP-1, GIP, glucagon — the incretin and glucagon receptors that anchor modern metabolic peptide pharmacology. A primer on the receptor landscape.
Semaglutide vs Tirzepatide: A Side-by-Side Comparison
Both are approved metabolic peptide therapeutics. One is a single-receptor agonist, one activates two receptors. Here's what the research actually shows.
Cagrilintide: The Long-Acting Amylin Analog
A modified amylin analog studied in combination with incretin agonists. Why amylin pharmacology is the underrecognized half of modern metabolic research.
Tirzepatide: The Dual Receptor Mechanism Explained
Tirzepatide is the first approved dual GLP-1/GIP receptor agonist. A primer on why dual-incretin pharmacology matters and how the molecule was engineered.
Axis 02 — Growth-Hormone Axis
Ghrelin-receptor agonism and pulsatile GH-release research.
Articles here cover the GHRP class and its representative, ipamorelin — the cleanest published reference for pulsatile growth-hormone research without cortisol or prolactin confound.
1 note in this axis
Axis 03 — Tissue Repair & ECM
BPC-157, TB-500, and GHK-Cu — the canonical tissue-research trio.
Articles cover the mechanism literature on each member of the tissue-research trio: BPC-157 (nitric-oxide / angiogenesis), TB-500 (Thymosin β4 actin biology), and GHK-Cu (copper-tripeptide extracellular-matrix work).
3 notes in this axis
GHK-Cu: A Primer on the Copper Tripeptide
Glycyl-L-histidyl-L-lysine bound to copper(II). Among the most-studied peptide-metal complexes in cosmetic and tissue-research literature.
TB-500: A Reference on the Thymosin Beta-4 Fragment
A 17-amino-acid fragment of one of the most abundant proteins in mammalian cells. Mechanism, half-life, and why it pairs with BPC-157 in tissue-research literature.
What Is BPC-157? A Reference on the Body Protection Compound
A synthetic pentadecapeptide drawn from a sequence in gastric juice. Mechanism, half-life, and why it's one of the most-studied peptides in laboratory tissue-repair research.
Methodology
Cross-axis reference notes: COA reading, HPLC, mass spec, storage, reconstitution, pricing, history.
The methodology notes underwrite every other article. Reading a Certificate of Analysis correctly is the prerequisite for evaluating anything else — these articles are the prerequisite reading.
6 notes in this axis
Why Do Research Peptides Cost What They Cost?
A 30-amino-acid peptide for $200 is normal. A 9-amino-acid peptide for $50 is also normal. The pricing logic is more rational than it looks.
A Brief History of Peptide Synthesis
From solution-phase to solid-phase to the modern automated synthesizer — how research-peptide manufacturing actually got to the point where you can order a 39-amino-acid molecule for under $200.
Endotoxin and Bioburden Testing for Research Peptides
The two tests that matter for cell-culture and animal-model work — and why most cosmetic-grade material skips them.
Reading a Certificate of Analysis: A Field Guide
Every legitimate research-peptide supplier publishes a COA per lot. Here's what each section actually means — and which numbers you should trust.
HPLC Purity: What the Chromatogram Actually Tells You
A purity percentage with no chromatogram is roughly worthless. Here's how to read the underlying data and what each peak means.
Storage and Reconstitution Best Practices for Research Peptides
Lyophilized peptides are stable. Once reconstituted, the clock starts. A practical reference on what to use, what to avoid, and what kills a vial.
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