M1 cells grown inside laminin-1 are plasmacytoid (A) Transmission electron microscopy shows that M1 cells treated by laminin-1 exhibited typical ultrastructural findings of plasmacytoid differentiation, such as replacement of organelles by microfilaments and intermediate filaments (B-D). Capuano ACT & Jaeger RG. Oral Oncol, 40: 36-42, 2004.