Freeze-fracture replicas of the basal plasma membranes in the epidermis of intrauterine larval Salamandra salamandra reveal numerous orthogonal arrays of membrane-associated particles on the P-fracture face. The arrays, whose function is unknown, comprise 10 to 200 particles with a diameter of 7 nm each; the number of arrays varies from 0 to 3/μm2. Extrauterine, aquatic larvae do not exhibit these membrane specializations. © 1980, Academic Press, Inc.. All rights reserved.
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