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In this diagram of an hemisegment A1-A7, anterior is left and dorsal is up. Each sensory cell is represented by a closed shape. Note however that hemisegment A1 may be slightly different (for example, the es organ vp4a is sometimes missing, V. Orgogozo, personal observations).
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Sensory
organs are arranged in three clusters: the dorsal cluster
(sensory organs whose names start with d), the lateral cluster (sensory
organs whose names start with l), and the ventral cluster (sensory
organs whose names start with v). The ventral cluster has been further
refined into the v' and v regions.
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