Fig. 3. Inner HF structure clones of transient progenitors. Clones induced on D11 and observed on D14. (A-F) Clones of transient progenitors (absence of labeling in the matrix). The number of labeled cells (in red rectangles) reveals the proliferative potential of the progenitors. (A,B) IRS progenitor divided once. (C,D) Cuticle progenitor divided once. (E,F) Medulla progenitor divided two or three times. (G-L) Clones of permanent precursors (labeled cells in the matrix, arrowheads) in the same experiment. (G,H) IRS; (I,J) cuticle; (K,L) medulla. Scale bars: 100 µm in A,C,E; 25 µm in B,D,F.