[R] conditional coloring of image labels

[Jake Michaelson]

Hi all,

I am interested in plotting a heatmap of a set of genes.  I would like the 
text labels of these genes to be colored red rather than black if they meet  
certain statistical criteria (using an if statement).  I'm not sure how to 
change individual color labels without changing them all.  Can anyone provide 
some insight on how to do this?

Thanks in advance,

Jake