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We investigated the relationship between the degeneration of spinal motor neurons and activation of N - methyl - d - aspartate ( NMDA ) receptors after neuraxial morphine following a noninjurious interval of aortic occlusion in rats .
 Chemical: N - methyl - d - aspartate; Chemical: NMDA; Chemical: morphine; Disease: aortic occlusion
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: N - methyl - d - aspartate; Chemical: NMDA; Chemical: morphine; Disease: aortic occlusion