3D growth of C3 cells.

<p><b>A</b>. Phase contrast microscopy (20× magnification) of C1 and C3 cells grown as dense cultures for 3 days. <b>B</b>. Growth of C1 and C3 cells after 10 days in soft agar. <b>C</b>. Phase contrast microscopy (12× magnification) of C1 cells or C3 cells in grown for 10 days under non-adherent conditions.