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In a message dated 97-04-05 08:13:51 EST, you write: << sulfur is neurotoxic? >> All chemicals are toxic to some extent. Certain compendia list the toxicity of these as LD50 (lethal dose that will kill 50% of the test animals). All personnel in the chemical industry would be afflicted en masse if sulfur and other chemicals were the causal factors of PD. To my knowledge, the only one associated with causing PD is the mishap in California with the 'failed' designer drug. Michel