Smad1/5 phosphorylation induced by BMP-4 , indicating activation of BMP signalling , was the same whether BMP-4 was used alone or combined with activin+/-GnRH .
B-GeneOrGeneProduct O O O B-GeneOrGeneProduct O O O O B-GeneOrGeneProduct O O O O O O B-GeneOrGeneProduct O O O O O O B-GeneOrGeneProduct O