Testosterone production and regulation visualizes HPG axis feedback, brain, pituitary, and testis drive hormone flow to tissues for growth and fertility. Outline diagram
1 × €7.99 
T cell functions outline depicts helper CD4, cytotoxic CD8, and regulatory cells guiding activation, killing infected cells, and suppression with arrows and labels. Outline diagram
1 × €7.99 
Estrogen brief diagram shows hormone production and functions across body, highlights uterus, brain, and estradiol structure. Outline diagram
1 × €7.99 Subtotal: €23.97
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