Figure 6.

Circularly averaged Fourier transforms (FFTs) for the core regions of PR⁻ MuLV (solid line) and WT MuLV (dotted line). The FFT for the PR⁻ MuLV particles displays well defined peaks centered at 0.022 and 0.032 Å⁻¹, corresponding to spacings of 45.4, and 31.8 Å. In contrast, the FFT for the WT MuLV displays two broad peaks centered at 0.015 Å⁻¹ and 0.025 Å, corresponding to spacings of 67 and 40 Å, respectively, in real space.