since the cellular origin of this entity is unclear and its ultrastructure has not been described before , we processed formalin-fixed samples for electron microscopy , which revealed three cell types : small lymphocytes with cleaved nuclei , large lymphocytes with vesticular noncleaved nuclei , and mesenchymal stromal cells occasionally bearing desmosomes or hemidesmosomes .
C0007634
cellular
C0007610
nuclei