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mus is not a standard abbreviation "muscle" or "muscular". RTECS uses ims for "intramuscular".
mus appears on MSDS's in the context of a lethal or toxic dose concentration. Examples of such concentrations include LD50 and LC50 values as well as related terms such as TDLo (toxic dose, low), LDLo (lethal dose, low), and LCLo (lethal concentration, low).
In the following examples from actual MSDS's, "mg/kg" refers to the specified quantity (in mg) of the test chemical per kilogram (kg) of animal body weight:
7,548 mg/kg (inhalation, mus)
ORL-MUS 4 mg kg-1
LD50:(IMS,MUS) 1190 MG
In the examples above, ORL-MUS above refers to an oral exposure route in mice and (IMS,MUS) refers to intramuscular injection in mice.
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It is sometimes difficult to assess the relative risks of chemicals when one LD50 is given for inhalation and another is given for injection. One has to consider the plausible routes of entry. For example, exposure to a vapor is much more likely through inhalation than through ingestion or injection.
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