Illustration of human muscle cells

"Colorized SEM of a human neutrophil white blood cell (blue) interacting with two rod-shaped, multidrug-resistant (MDR) Klebsiella pneumoniae bacteria (blue)"

Illustration of the biological cell cycle

Colorized antique illustration of the human brain

Illustration of male sperm cells fertilizing a female egg

"Diffusion MRI, also referred to as diffusion tensor imaging or DTI, of the human brain"

"Diffusion MRI, also referred to as diffusion tensor imaging or DTI, of the human brain"

"Diffusion MRI, also referred to as diffusion tensor imaging or DTI, of the human brain"

"Diffusion MRI, also referred to as diffusion tensor imaging or DTI, of the human brain"

Filamentous Ebola virus particles (colored red) budding from a chronically-infected VERO E6 cell (colored blue)

"Diffusion MRI, also referred to as diffusion tensor imaging or DTI, of the human brain"

"Diffusion MRI, also referred to as diffusion tensor imaging or DTI, of the human brain"

Human red blood cell, illustration

Human sperm

Human sperm and egg, illustration

Human sperm and egg, illustration

Human red blood cell, illustration

Human red blood cell, illustration

Human sperm and egg, illustration

Human sperm and egg, illustration

Human sperm and egg, illustration

Human sperm, illustration.

Human sperm, illustration.

"Cell phone and human brain, Illustration"

Human nerve cell, artwork

Human nerve cell, artwork

Human nerve cell, artwork

Human nerve cell, artwork

Human nerve cell, artwork

Human nerve cell, artwork

Human nerve cell, artwork

Human nerve cell, artwork

Human nerve cell, artwork

Human nerve cell, artwork

Human nerve cell, artwork

Human nerve cell, artwork

Illustration of a human sperm cell