of MaMAs was placed on 100 mesh carbon-coated, Formvar-coated copper
grids pretreated with poly-
imaging with negative staining, the samples were negatively stained
with Millipore-filtered aqueous 2% uranyl acetate. The stain was blotted
dry from the grids with a filter paper, and the samples were allowed
to dry. Then, the samples with or without negative staining were examined
in a JEM 1010 transmission electron microscope (JEOL USA, Inc., Peabody,
MA) at an accelerating voltage of 80 kV. Digital images were obtained
using an AMT imaging system (Advanced Microscopy Techniques Corp.,
Danvers, MA).