An overview of the lineage with gene expression shown. This is a compact representation of the entire lineage of an embryo with the pha-4 gene tagged with a red fluorescent protein. The branches are color-coded by the strength of the red expression: gray if there is no expression, generally the case early in the development; green where there is a detectable low level of expression; red where expression is strong. Branch labels are offered for every tenth nucleus which is sufficient to identify the cell groupings where the gene is expressed: strongly in the E lineage, less so in some MS lineages and in some daughters of ABa. The tagged gene is only expressed in the latter stages of the embryonic development. This tree is interactive in AceTree so the user can bring up the image corresponding to any point by clicking on the branch in question.