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A systematic lowering in mass of strangeness ambiguous $pK^0_S$ peaksrelative to the $nK^+$ is noted. We discuss how measurement of $\gamma p\to\Theta^+ K^0_S\to p K^0_S K^0_S \to p\pi^+\pi^-\pi^+\pi^-$ in association with$\gamma p\to \Theta^+ K^0_S\to n K^+ K^0_S$ can help to clarify the nature ofthe narrow baryon state claimed in $p K^0_S$ invariant mass distributions. Thiscan both establish the $\Theta^+$ in a single experiment and also reveal, orplace severe limits on, the existence of an associated $\Sigma_5$ pentaquark

The pentaquark Θ+ in nK+ and pK0S, and its Σ+5 partner

The pentaquark Θ⁺ in nK⁺ and pK⁰_S, and its Σ⁺₅ partner