Abstract
In this Letter, an alternative string theory in twistor space is proposed for describing perturbative $N=4$ super-Yang-Mills theory. Like the recent proposal of Witten, this string theory uses twistor worldsheet variables and has manifest spacetime superconformal invariance. However, in this proposal, tree-level super-Yang-Mills amplitudes come from open string tree amplitudes as opposed to coming from $D$-instanton contributions.
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