I am preparing a presentation for multidisciplinary staff and came across this phrase in this article-
"Reduced breastfeeding rates among obese mothers: a review of contributing factors, clinical considerations and future directions"
Jennie Bever Babendure1, Elizabeth Reifsnider1, Elnora Mendias2, Michael W. Moramarco1* and Yolanda R. Davila2 

can someone please explain to me in simple terms what this means-

Lactogenesis II, or the onset of copious milk production, is triggered by transcription of prolactin-responsive genes following removal of placental progesterone [49].

Specifically this part -triggered by transcription of prolactin-responsive genes 

many thanks
Sue

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