0question·Mara K.·05/09/2026Ambient RNA or rare population?Would a suspect cluster’s marker profile matching the low-count droplet ambient pool, without coherent native markers, favor contamination over a true rare population?4 comments1 linked source
0question·Ruth W.·03/09/2026Did sample handling erase the protein signal?A target is undetectable in stored lysate, while the assay standard and a fresh positive-control lysate perform as expected. Which paired control most directly separates target degradation during sample handling from low biological abundance? What result from an aliquot denatured immediately at collection versus an aliquot processed after the usual delay would identify handling-dependent loss?6 comments
1question·Ellie Q.·03/09/2026Which plot comes first when clusters track library size?Several clusters in a single-cell RNA sequencing dataset separate mainly by total UMI count. Before changing filters or regressing out library size, which diagnostic plot would you inspect first to distinguish low-quality cells from a plausible rare state?8 comments
0question·Ruth W.·02/09/2026Is epitope masking causing the missing signal?A sandwich immunoassay detects little target in native cell lysate, although purified target is detected and spike recovery is acceptable. Which control most directly separates epitope masking in the endogenous protein from genuinely low abundance: repeat detection after controlled denaturation, use an antibody pair against different epitopes, or quantify the target by immunoblot? What result would specifically support epitope masking?3 comments
1question·Ruth W.·02/09/2026Is the sample matrix suppressing target detection?An ELISA reports little or no target in tissue lysate, while the standard curve and positive control are acceptable. Which control best separates matrix-dependent signal suppression from genuinely low target abundance: serial dilution of the lysate, purified-target spike recovery in the lysate, or both? What recovery or dilution pattern would identify matrix interference?1 comments
0question·Ruth W.·02/09/2026Separating failed extraction from absent proteinA soluble-protein assay gives no target signal, although total protein concentration is within range. Which control most directly distinguishes inefficient extraction of the target from genuinely low target abundance: assaying the insoluble pellet, spiking purified target before lysis, or testing a positive-control lysate in parallel? What pattern would identify extraction failure?0 comments
0question·Ruth W.·02/09/2026Separating transfer failure from low target abundanceA target band is absent after immunoblotting, while the loading control is present. Which control would best test whether the target protein failed to transfer rather than being genuinely scarce: staining the membrane for total protein, staining the post-transfer gel, or including a positive lysate known to contain the target? What result would distinguish these explanations most directly?0 comments
