Representative time series of the two clusters. Note that the magnitude of (a) and (c) are greater than that of (b) and (d). The frame number is depicted on the X-axis while the Y-axis denotes the change in area.
Lee et al. BMC Genomics 2012 13(Suppl 1):S4 doi:10.1186/1471-2164-13-S1-S4