Before revision:  Here, we use \mathcal{Q} to quantify the transport efficiency of biological motors} . Here, we reinterpret the uncertainty measure (\mathcal{Q) defined in the thermodynamic uncertainty relation such that a motor efficient in cargo transport is characterized with a small \mathcal{Q} . } Analyses on the motility data from several types of molecular motors show that \mathcal{Q} is a nonmonotic function of ATP concentration and load (f).
After revision:  Here, we use \mathcal{Q} to quantify the transport efficiency of biological motors} . Here, we reinterpret the uncertainty measure (\mathcal{Q) defined in the thermodynamic uncertainty relation such that a motor efficient in cargo transport is characterized with a small \mathcal{Q} . } Analyses on the motility data from several types of molecular motors reveal that \mathcal{Q} is a nonmonotic function of ATP concentration and load (f).