Summary
1. Using immunological methods, we have identified parvalbumin-like material in the triclade flatworms,Polycelis nigra, Polycelis auriculata, Crenobia alpina, Dugesia tahitiensis, andDugesia polychroa.
2. Western immunoblot analysis of these five species revealed heat stable parvalbumin-immunoreactive proteins between 32 kD and 44 kD.
3. Proteins at 19 and 32 kD revealed intense labeling with45Ca2+.
4. Double immunodiffusion of planarian supernatants showed complete fusion of precipitates, indicating immunological relatedness of the parvalbuminlike material among the species investigated.
5. Immunocytochemical studies exhibit parvalbumin-immunoreactive material exclusively in neurons supporting the notion of an early evolutionary appearance of these proteins in the nervous system.
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Hutticher, A., Kerschbaum, H.H., Kainz, V. et al. Parvalbumin-immunoreactive proteins in the nervous system of planarians. Cell Mol Neurobiol 15, 401–410 (1995). https://doi.org/10.1007/BF02071876
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DOI: https://doi.org/10.1007/BF02071876