Changed response to external stimulus.
http://purl.obolibrary.org/obo/UPHENO_0050079
http://purl.obolibrary.org/obo/WBPhenotype_0000738
http://purl.obolibrary.org/obo/ZP_0106498
http://purl.obolibrary.org/obo/UPHENO_0049586