Assertion: african clawed frog | /r/CapableOf | think to be pregnant
Facets:
Source sentences:
text: In the 1940s they were used to test for pregnancy in humans by injecting the frog eggs with the urine from women thought to be pregnant.
text: In the 1940s they were used to test for pregnancy in humans by injecting the frog eggs with the urine from women thought to be pregnant.