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Alcian blue can be used to quantitate acidic glycans both in microspectrophotometric quantitation in solution or for staining glycoproteins in polyacrylamide gels or on western blot s. Biochemists had used it to assay acid polysaccharides in urine since 1960s for diagnosis of diseases like mucopolysaccharidosis but from 1970 's , partly due to lack of availability of Alcian and partly due to length and tediousness of the procedure , alternative methods had to be developed e.g. Dimethyl methylene blue ( DMB ) method .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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