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In quick-freeze deep-etch preparations the plasma membrane can be
seen to contain plaques or plates of intramembrane particles (IMPs)
that are regularly aligned in rows with a center-to-center spacing
between rows of 25 nm. These plaques remain in the P-fracture face of
the plasma membrane and are found mostly on the anterior ventral
surface of the cell near the anterior suture. Their function is not
known. For discussion see Allen, J. Ultrastruc. Res. 63:64-78, 1978
and Hufnagel, Micros. Res. Tech. 22:225-264, 1992. EM taken on 5/26/92
by R. Allen with Zeiss 10A TEM. Neg. 19,800X. Bar = 0.25µm.
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