Where are the GT?
Make sure that you are looking for the GT on the ventral side of the clitellum. The GT can look like white little pimples inside the clitellum of very mature earthworms.
on ALL the segments in the clitellum and on all segments surrounding the clitellum
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on HALF of the segments in the clitellum - there are no GT on the segments outside of the clitellum
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