11198
However , in lactating rats the diurnal peak was significantly reduced , resulting in a flattened rhythm , and three days after weaning , basal HPA activity was markedly suppressed : the number of pulses and underlying basal levels of corticosterone were reduced and the diurnal rise phase delayed .
 corticosterone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 corticosterone