"Fat tissue, SEM"

Blood cells, SEM

Campylobacter jejuni bacteria, SEM

Campylobacter jejuni bacteria, SEM

Campylobacter jejuni bacteria, SEM

Breast cancer cells, SEM

Breast cancer cells, SEM

Breast cancer cells, SEM

Breast cancer cells, SEM

Sickle cell anaemia, illustration

Breast cancer cells, SEM

Sickle cell anaemia, illustration

MRSA bacteria. Coloured scanning electron micrograph (SEM) of methicillin-resistant Staphylococcus aureus (MRSA) bacteria (round). MRSA is a Gram-positive, round (coccus) bacterium that is resistant to many commonly prescribed antibiotics.

Blood clot, illustration

Alzheimer's disease. Computer illustration of a healthy neuron (left), a neuron with amyloid plaques (yellow, centre), and a dead neuron being digested by microglia cells (red, right).

Arteriosclerosis, illustration

Lung cancer cells dividing, illustration

"Abnormal human sperm cell, SEM"