Figure 9: Possible velocity profiles of molecular motor as a function of time. We fix the values of α = 4:8s and β= 4:7s in equation 26. The values of kv are 5:6x103 s-1 for orange and red lines, and 8:9x10-1 s-1 for green and blue. Note that a smaller value of this parameter softens engine acceleration at the beginning of its walk. The values of vmax are 5.25, 3.25, 1.5 and 0.44 micrometers per second from top to bottom.