English: Figure 6-8. Percent change in CSA of Type I (slow twitch) and Type II (fast twitch) myofibers in postflight versus preflight muscle biopsies from 8 crewmembers. From reference. [§ 1]Template:Pages
The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]