Distribution of H I-selected Coma galaxies (coloured circles) and the field galaxy reference sample (hexagonal bins indicating the number of sources in each bin with a logarithmic colourscale) in the stellar mass – specific star formation rate plane. The red line represents the z = 0 star forming main sequence relation of Sargent et al. (2014), while dashed lines above and below indicate the ±0.6 dex offset from SFMS. Black crosses mark Coma galaxies with tails at H_α (Yagi et al. 2010) or UV (Smith et al. 2010) wavelengths, while red circles denote ongoing AGN activity. Black errorbars are the mean uncertainties of the Coma measurements. Finally, red circles indicate galaxies identified as AGN in the literature (Mahajan et al. 2010; Gavazzi et al. 2011; Toba et al. 2014).