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Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
Biopsy. Various forms of gynecological biopsy are shown.
Forms of primary adult glaucoma: (a) in chronic open-angle glaucoma, the anterior chamber angle rema
Three active forms of vitamin A: all-trans-retinol, -retinal, and –retinoic acid
Regions involved in the control of genetic expression of the lac operon
The four RNA ribonucleotides. Shown in their mono-phosphate forms