= Solution
\b[There is no large, consistent stimulation by added <Wnt protein> ligand in the displayed experiment.] The paired bars are close in the empty-vector and TCF-long conditions; TCF-short shows a modest upward difference, while some other pairs decrease slightly. The error bars and absence of raw replicate information do not permit a firm significance claim. This result concerns the particular reporter and transfection conditions, not every aspect of endogenous <Wnt signalling>. A known ligand-responsive positive control, dose/time testing and validation of receptor/pathway competence would distinguish a genuinely weak response from failed stimulation or saturation caused by transgene expression.
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