4471
Although stone - formers were not found to display any features of magnesium metabolism that were different from those in the control group , their lower urinary excretion of magnesium in relation to calcium may be a factor in their increased stone - forming propensity .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities:  
Answer:
 None