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![Negative feedback in the pituitary thyroid axis](http://d3e1m60ptf1oym.cloudfront.net/57e361c6-09e0-11e3-9516-372fbc6ef32c/pituitary_thyroid_negative_large.jpg)
![Structure of plasma membrane, labeled.](http://d38zjy0x98992m.cloudfront.net/c2ccffc6-09ca-11e3-881f-23a6af2316d8/plasma_membrane_large.jpg)
Structure of plasma membrane, labeled.
Structure of cell membrane with lipid bilayer, cholesterol, transmembrane proteins and pores.
© Alila Medical Media
Image size: 39.1 Mpixels (112 MB uncompressed) - 6250x6249 pixels (20.8x20.8 in / 52.9x52.9 cm at 300 ppi)
![Structure of plasma membrane, unlabeled.](http://d3e1m60ptf1oym.cloudfront.net/ca2975c4-09ca-11e3-8d91-0fa2fcebd6e3/plasma_membrane_large.jpg)