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We analyze the twistor space structure of certain one-loop amplitudes ingauge theory. For some amplitudes, we find decompositions that make the twistorstructure manifest; for others, we explore the twistor space structure byfinding differential equations that the amplitudes obey.Comment: 41 pp. Reference in introduction to forthcoming new interpretation;  improved analysis of --+++ non-supersymmetric one-loop amplitude; additional  minor corrections; v.3: minor clarifications and reference adde

Twistor Space Structure Of One-Loop Amplitudes In Gauge Theory