  We explain a procedure to manifest the Bern-Carrasco-Johansson duality
between color and kinematics in $n$-point one-loop amplitudes of a variety of
supersymmetric gauge theories. Explicit amplitude representations are
constructed through a systematic reorganization of the integrands in the
Cachazo-He-Yuan formalism. Our construction holds for any nonzero number of
supersymmetries and does not depend on the number of spacetime dimensions. The
cancellations from supersymmetry multiplets in the loop as well as the
resulting power counting of loop momenta is manifested along the lines of the
corresponding superstring computations. The setup is used to derive the
one-loop version of the Kawai-Lewellen-Tye formula for the loop integrands of
gravitational amplitudes.
