Histograms of the sSFR of the late-type galaxies our three samples, estimated by modeling their SED. The top plot displays in blue the histogram of the sSFR of the 31 late-type galaxies found in dynamically-young, spiral-dominated groups. Overplotted in red is the corresponding histogram of the 42 galaxies in dynamically-old elliptically dominated groups. The middle and bottom plots present the histograms of the 52 late-type galaxies in the Smith et al. (2007a) interacting galaxy pairs, as well as the 71 SINGS late-type galaxies. The arrows indicate the median sSFR value of each distribution.