| Abstrakt: |
The primitive nature of the sponge epithelium was revealed primarily by the mode of intercellular attachment. The zonula adhaerens (terminal bar) and macula adhaerens (desmosome) which occur in most metazoa are totally lacking in the exo- and endopinacoderms of Micoricona prolifera. Although a careful search was made for examples of the zonula occludens (tight junction complex), none were seen. There is still the possibility that they occur, but if so, they occupy only a small portion of the junctional area. |
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