aa Anterior adductor muscle ae Arm elevator muscle bg Buccal groove cI First pair of lophophore cirri cII Second pair of lophophore cirri cIII Third pair of lophophore cirri cm Cirrial muscle dv Do...
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A. J. Rowell (1960) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: