🔬 New bioRxiv preprint: Arg-C Zero, recombinant arginyl endopeptidase with >99% cleavage efficiency, proline-adjacent cleavage, Histone and labile PTMs analysis like ADP-ribosylation and comparable proteome depth to Trypsin. doi.org/10.64898/2026.05.28.… #Proteomics #TeamMassSpec

Surprised to discover that Thermo Fisher appears to show a fake western blot for the validation of one of their p53 antibodies. I've added a diagram to show the very similar bands. This does not appear to be one of the "published figures", but their own internal data.

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Introducing Trypsin RMS - our third product is here. Recombinant. Methylated. Sequencing-grade. The robust Trypsin #proteomics labs need, without the batch variability of animal-derived alternatives. Learn more: kplbio.com/trypsin/ #TeamMassSpec

New publication alert!📢 KPL collaborates w/ @JesperOlsenLab on the first systematic comparison of LysC enzymes for proteomics published in @JProteomeRes A. lyticus LysC: >90% cleavage efficiency, >97% specificity Read more: pubs.acs.org/doi/10.1021/acs… #TeamMassSpec #proteomics

“Show me the mechanism of action.” “Uh. from the p-p-perturb seq? right here. Knocks down Gene X, and the cells shift into Cluster 7." “You used fkn UMAP again. FUCK. Zoom in.” “Sorry?” “Zoom. The fuck. In.” “…Okay.” “Do you see it?” “…See what?” “He doesn’t see it. The cell biology postdoc from Stanford does not know how to see a cell. He stares at a two-million-cell embedding and doesn’t see the conflations he just planted in my S3 bucket. WHERE is the temporal resolution?” “The… what?” “Where is the time? You hit the cell with a perturbation and you measured it once. Once. That’s not a mechanism. That’s a fucking POSTCARD!” “We sequenced at 72 hours. That’s standard.” “Standard is not the same as correct. You are aliasing causality. You compressed a dynamic process into a static endpoint and you’re think you will cure metastatic cancer.” “But the differential expression is significant.” “WOW! DIFFEWENTIAL EXPRESSION IS SIGNIFICANT! WOW! WHEN THE FUCK IS IT NOT. Yes, because statistics is Mario Kart. A fantasy land where causality is optional and variance disappears if you collect enough cells. Real biology has inertia. Feedback. Competing pathways. Do you understand the difference between correlation and mechanism? Or did you flunk out of STAT 101?” “…I mean, we saw Gene X regulate Pathway Y.” “No. You saw Pathway Y exist in the same cell after you kicked it down the stairs and waited three days. That’s not even a crime scene, you dimwit. That is a post-mortem autopsy.” “The model inferred a trajectory--” “STOP the buffoonery. Do not blame the model. The model is a mirror. In this particular case, you can see it mirrors the clusterfuck you just created in my biosafety cabinet. If the reflection is warped, it’s because your measurement is warped.” “Pull up the raw counts.” “…Okay.” “Scroll. Cell 14,982. Read it to me. What does it say?” “Uh… mitochondrial genes up, ribosomal genes down-” “And?” “…And stress response markers?” “Yes. Because you poisoned the cell and waited long enough for it to panic. Where is the early signaling? Where is the metabolic inflection? Where is the first irreversible decision?” “We don’t capture that.” “Exactly. You built a platform that cannot see the mechanism. YOUR PLATFORM IS FUCKING BLIND.” “The virtual cell...showed the perturbation effect cleanly.” “Yes. because your VIRTUAL CELL IS VIRTUAL. it assumes the cell is a bag of transcripts. Do you think metabolites show up? OR AN ISOFORM? AN ISOFORM, THAT WILL DEGRADE IN THE CELL BEFORE YOU EVER REACH YOUR SENSOR? THAT ONE? YOU THINK THAT'S HOW CELLS WORK?” “So what do you want me to do?” “Delete the atlas.” “What?” “Delete it. The whole thing.” “But that’s the core result.” “It’s three weeks of garbage narrative built on a blind instrument. Delete it.” “…Now what?” “Now you rebuild the measurement. You observe the cell while the perturbation propagates. You track chemistry, not just transcripts. You capture the first divergence, not the final corpse.” “That’s… not perturb-seq anymore.” “Exactly.” door slams