2564
These systems were investigated in vivo for skin penetration , skin irritation , and the ability to knockdown glyceraldehyde 3 - phosphate dehydrogenase ( GAPDH ) protein levels in animal models .
 Chemical: glyceraldehyde 3 - phosphate
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: glyceraldehyde 3 - phosphate