Mixtures of middle (M) and bottom (B) particles are more infectious than equal amounts of either particles alone. M particles contain 24% RNA (268 RNA, MW 2.8x106 daltons). B particles contain 38% RNA (34S RNA, 5. 0 * 106 daltons).
The
base
compositions
of
the
two
RNAs
difler.
The
B
particle
RNA
contains
more
guanylic
acid
and
less
cytidylic
acid
than
the
RNA
of
M
particles.
Two sizes of dsRNA (replicative form), corresponding to M and particle RNA, have been found in Cowpea mosaic virus infected cowpeas; The total genome is reported to be divided among, the two pieces of RNA. M.RNA and B-RNA do not have any common genes.
The
protein
capsid
of
Cowpea
mosaic
virus
consists
of
two
different
proteins.
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