Is the protein lefty an inhibitor of nodal?
['The expression of lefty, an inhibitor of nodal is often reduced in tumor cells.', ' Nodal, and an inhibitor, Lefty.', 'as well as the expression of Lefty, an inhibitor of nodal signaling,', 'he Nodal inhibitor lefty', 'The morphogen Nodal was proposed to form a long-range signaling gradient via a reaction-diffusion system, on the basis of differential diffusion rates of Nodal and its antagonist Lefty.']
['Yes, lefty is an inhibitor of nodal.']
['yes']