[![enter image description here][1]][1]

There is the code I wrote the dotplotDotPlot(object = cluster, genes.plot = c("Hcn4","Shox2","Nkx2-5","Nppa","Tnnt2","Gja5","Tbx18","Tbx3","Isl1","Scn5a","Cacna1d"), plot.legend=TRUE) And I got the picture. I was confused about the legend with the Negative number showed about avg.exp.scale. Does it mean that the cluster expressed the genes at low level or that gene was down regulated?(like the Shox2 in the "0" compared with "2"). [1]: https://i.sstatic.net/fXEYw.png

[![enter image description here][1]][1]

Here is the code I used:

DotPlot(object = cluster, genes.plot = c("Hcn4","Shox2","Nkx2-5","Nppa","Tnnt2","Gja5","Tbx18","Tbx3","Isl1","Scn5a","Cacna1d"),  plot.legend=TRUE)

I was confused about the legend with the Negative number shown for avg.exp.scale. Does it mean that the cluster expressed the genes at low level or that gene was down regulated?  (like the Shox2 in the "0" compared with "2"). [1]: https://i.sstatic.net/fXEYw.png