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 (ăk′tə-vĭn, ăk-tĭv′ĭn)
A polypeptide growth factor that is synthesized in the pituitary gland and the gonads and stimulates the secretion of follicle-stimulating hormone.

[activ(ate) + (inhib)in (from its activating follicle-stimulating hormone).]
References in periodicals archive ?
The team found that the Wnt pathway loads up the cellular machinery to begin copying and activating genes, and then the Activin pathway ramps up that activity many fold.
Net increase in stimulatory input resulting from a decrease in inhibin B and an increase in activin A may contribute in part to the rise in follicular phase follicle-stimulating hormone of aging cycling women.
a-1,6 fucosyltransferase small interfering RNA suppressed transforming growth factor-[sz]RII and activin receptor-like kinase-5 core fucosylation and inactivated transforming growth factor-[sz]/Smad2/3 signaling
Examination of maternal plasma erythropoietin and activin A concentrations with regard to circulatory erythroblast levels in normal and preeclamptic pregnancies.
Myostatin (MSTN) and activin are members of the transforming growth factor-[beta] superfamily.
1- hiPSCs were incubated for 3 days with RPMI-1640 medium (Gibco, USA) containing 100 ng/ml Activin A (R&D, USA) and FBS (Gibco, USA).
The abnormal vascular structures in HHT were found to result from mutations in the transforming growth factor6/bone morphogenetic protein signaling pathway genes endoglin [5, 6] and activin type-II-like receptor kinase 1 [7].
The seven members of the BMP type-I receptor family, activin receptor-like kinase (ALK) 1-7, play critical roles in human development and physiology.
Therefore, we considered activin A as a positional candidate affecting litter size and evaluated their sequence for potential causative genetic variation.
The activin receptor-like kinase 1 gene: genomic structure and mutations in hereditary hemorrhagic telangiectasia type 2.
The expression of Bone morphogenetic transforming growth factors fibroblast growth factors activin follistatin are associated with morphogenesis.
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