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Internal structure of a plant cell. Digital illustration. Clipping path included
Dopamine and dopamine receptor, molecular model Molecular model of a dopamine molecule (red) approaching a dopamine receptor D1 (blue) in a cell membrane (orange)
The human male penis illustrations, illustration, human, male, science, anatomy, biology, reproductive system, genitals, organs, muscles, genitalia, external, penis, urethral opening, frenulum
Desiccated leaf skeleton isolated against black background - North Carolina, USA
