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Size distribution for 67 PR− MuLV and 32 WT-MuLV particles. PR− MuLV and WT MuLV have comparable diameters (Do) (PR− MuLV 1,260 ± 114 Å, WT MuLV 1,239 ± 139 Å). The irregular polygonal shape of the core in the WT MuLV precluded measurement of the diameter. The more rounded core in the PR− MuLV was readily measured and yielded a core diameter (Di) of 958 ± 102 Å.
