Non-catalytic subunit of oplophorus-luciferin 2-monooxygenase. May stabilize the active conformation of the catalytic subunit. Heterotetramer of a catalytic 19 kDa and a non-catalytic 35 kDa subunit. The shrimp has luminous glands at the base of its antennae and legs, and ejects a cloud of brightly luminescent secretion from the base of its antennae upon stimulation.