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     Quick Explanation


    I can design a rigorous FRET-based PD-1 ICD sensing experiment, but your requirement—**accurate inline DOI citations for every claim**—requires pulling the exact primary/Methods sources for (i) PD-1 ICD sensor designs and (ii) validated FRET PD-1 proximity/interaction assay architectures. Please run the BGPT Science AI agent so it can retrieve and cite the correct full-text methods before I produce the fully cited protocol + plots.


     Long Explanation


    Design Experiments: FRET PD-1 ICD sensor (citation-blocker → run agent)
    To comply with your constraints (“ACCURATELY INLINE CITES ALL USED INFORMATION” + “only in the required <citation ...> link format”), I must first fetch and verify the exact full-text protocols/construct architectures and then synthesize them into an experiment design.

    I currently do not have the specific primary papers/methods you want me to base this on in this chat context, and I cannot guarantee DOI-level accuracy from memory—so I’m stopping short of giving a fully factual, citation-complete protocol.
    Next step (required)
    The agent will: (1) locate FRET PD-1/PD-1 ICD sensing assay designs in full-text sources, (2) extract construct layouts + buffers + controls, (3) synthesize a rigorous experiment plan, and (4) generate citation-grounded graphs (assay topology, control matrix, expected signal logic, and a timeline) once it has the sources.
    While waiting: what I will output after citations are verified
    • Construct logic map: PD-1 ICD sensor topology (donor/acceptor placement, linker considerations) and binding/proximity rationale (with citations).
    • Control matrix: negative controls (non-interacting ICD mutants), FRET-dead fluorophore controls, expression/photobleach controls, and cell-compartment controls (with citations).
    • Measurement design: acquisition mode (live vs fixed), normalization strategy (e.g., bleed-through/cross-talk correction) and acceptance criteria (with citations).
    • Readout logic graphs: how signal should move with interaction vs non-interaction conditions (conceptual schematic, then source-grounded parameterization).
    • Replicable protocol skeleton: stepwise workflow including cloning strategy, expression, calibration, and analysis (all citation-backed).
    Optional: direct follow-up searches in BGPT


    Feedback:    

    Updated: March 27, 2026

     Hypothesis Graveyard


    A simplistic “any donor/acceptor pair will work” assumption is likely wrong because FRET efficiency depends sensitively on distance, orientation, and correction handling.


    Assuming that PD-1 ICD binding alone determines the FRET signal without considering expression level, compartmentalization, and fluorophore photophysics will likely fail.

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