undeveloped stage

See: embryo
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It appears that an undeveloped stage occurs suggest that it, is a spent female rather than an undeveloped one.
It's heartening to discover that Vonnegut's work, even at this early, relatively undeveloped stage, is still vital, still affecting, still capable of helping us through this thing.
Reinertson says that the exploration agreement on this advanced property fits Placer Dome's global strategy of taking a position in attractive prospects at an undeveloped stage.