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Table 2 Developmental stages at which perturbations were initiated

From: Embryonic lethality is not sufficient to explain hourglass-like conservation of vertebrate embryos

  Earliest Latest Evaluation of rate of lethal phenotypes
Zebrafish Sphere 30%-epiboly 24 hpf 48 hpf hatch
African clawed frog st. 8 st. 11 st. 28 st. 40 st. 45
Chicken HH5   HH16 HH20 HH25
  1. The pharyngula periods of zebrafish, African clawed frog, and chicken are 24 hpf (hours post-fertilization), st. 28 (stage 28), and HH16 (Hamburger Hamilton stage 16), respectively