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. 2001 Jun 12;98(13):7331–7335. doi: 10.1073/pnas.131213198

Figure 1.

Figure 1

Zebrafish embryos arrest when exposed to anoxia. (a) Four-cell embryos were collected and exposed to either a normoxic environment (air, 20.8% O2) or an anoxic (0% O2) environment. (b) Five-somite stage embryos were collected and exposed to either a normoxic or an anoxic environment for 24 h. Time 0 is the time when embryos began to arrest development, ≈4.5 h after initiation of producing an anoxic environment. The second time point is 24 h after time 0. Images were collected and analyzed by using ADOBE PHOTOSHOP 5.5. (Bar, ≈200 μm.)