A stage of embryonic development, seen in all animals except the sponges. It follows the blastula phase. The gastrula phase is marked by a dramatic restructuring called gastrulation. After gastrulation is complete, the embryo develops into a neurula[?].
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... first unit to form will be an Operational Conversion Unit[?] at RAF Conigsby[?] in 2004.
The Typhoon's combat performance, particularly compared to the upcoming F/A-22 ...