Fig. S2.

Controls of the specificity of the differential transcriptomic datasets with respect to corresponding cell types. Left panel, in situ hybridization for five genes belonging to the cluster archeocytes showing expression in cells with typical archeocyte morphology (nucleus with prominent nucleolus and many vitelline platelets). Images in the right column show enlarged views of stained archeocytes in the boxed areas in the middle column. (Scale bars, 300 µm.). Right panel, in situ hybridization for four genes belonging to the cluster other cells showing expression in diverse cell types (mesohyl cells for m.9897 and m.14674; basopinacocytes for m.29493; sclerocytes and archeocytes committed to sclerocyte fate for m.25497). (Scale bars, 400 µm.) Circle in m.25497 shows an unstained archeocyte.