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While the biological implications of many of these studies remain to be clearly established , that there is a clear need for standardization of experimental design and data analysis , and that the analysis of protein changes in specific neuronal cell types in the central nervous system remains a serious challenge , it appears that the quality and depth of the more recent quantitative proteomics studies is beginning to shed light on a number of aspects of neuroscience that relates to normal brain function as well as of the changes in protein expression and regulation that occurs in neuropsychiatric and neurodegenerative disorders .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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