newborn animals had no detectable gastrin binding , high serum gastrin levels ( 800-1,200 pg/ml ) , low antral gastrin levels ( 0.5-2.0 micrograms/g tissue ) , or high ph of gastric contents ( ph greater than 5.0 ) and did not respond to pentagastrin .
C0017151
gastrin
C0030859
pentagastrin