Abstract
cyst investiture in nonmuscle tropo- myosin may play a role in immune evasion in the snail host by protecting the sporocyst from amoebocyte attack. If true, this would be a prime example of molecular mimicry in its full and original sense s , which links common structures to the host-parasite relationship. The question of differentiating mol- ecular mimicry from molecular conser- vation, particularly when the shared structures originate in phylogenetically close organisms like flukes and snails (both protostomate metazoans), has been raised elsewhere 6. It was con- cluded that molecular mimicry could be superimposed upon the deeper physio- logical significance of the conserved, shared molecular structures in the special relationship that is parasitism, and that parasites might exploit molecular conservation to minimize their foreign- ness to their hosts. The comparisons made by Dissous
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