Before revision:  We show that, if a cell is exposed to a widely variable environment, cells may gain additional chemotactic accuracy by expressing multiple types of receptors with varying affinities for the same signal . As the uncertainty of the environment is increased, there is a transition between cells preferring to express a single receptor type and a mixture of types - hedging their bets against the possibility of an unfavorable environment.
After revision:  We show that, if a cell is exposed to a widely variable environment, cells may gain additional chemotactic accuracy by expressing multiple types of receptors with varying affinities for the same signal , as found commonly in chemotaxing cells like Dictyostelium. As environment uncertainty is increased, there is a transition between cells preferring to express a single receptor type and a mixture of types - hedging their bets against the possibility of an unfavorable environment.