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β2AR blocker reduces stress‐associated hair loss in human. (A) The procedure of participant recruitment and shed hair documenting during the human clinical studies. (B) A comparative analysis showed that there was a significant decrease (p < .05) in the number of shed hairs after PP‐HCl application in 14 of the 20 participants. All data are mean ± SD. ns means p >.05; *p ≤.05; **p ≤.01; ***p ≤.001; ****p ≤.0001.
