substage_of
immediately_preceded_by
immediately preceded by
starts_at_end_of
immediately preceded by
developmental stage
fertilized egg stage
pre-blastoderm stage
embryonic stage 1
FlyBase_development_CV
FBdv:00005291
Temporal ordering number - 40.
The embryonic stage that lasts from the end of fertilization to the end of the second nuclear division. Duration at 25 degrees C: approximately 25 minutes (0-25 minutes after egg laying).