Molecule of the Month
February 2026

Histones Across the Tree of Life

Uncovering the evolutionary diversity of histones

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SciArt Galleries
Irving Geis (1908-1997) was a gifted artist who helped illuminate the field of structural biology with his iconic images. The Geis Digital Archive features many of his illustrations in the context of their molecular structures.

Images used with permission from the Howard Hughes Medical Institute (www.hhmi.org). All rights reserved.

Myohemerythrin

B-DNA

Deoxyribonucleic Acid (DNA)

Z-DNA

Induced Lac Repressor

Carboxypeptidase A

Lysozyme (512)

Myoglobin

Deoxyhemoglobin

Collagen

Hemoglobin

Lac Repressor

Aspartate Transcarbamoylase (ATCase)

DNA

Ribonuclease S

Cytochrome c (unbound)

Intermolecular Contacts in Hemoglobin S

Cytochrome c

Hemoglobin (1000)

Transfer Ribonucleic Acid (tRNA)

Trypsin

Tomato Bushy Stunt Virus (TBSV)

Oxyhemoglobin

Crambin

Hemoglobin S

Lysozyme (488)

Myoglobin Fold

DPG-Hemoglobin Complex

Immunoglobulin G (IgG)

A-DNA

TATA-Binding Protein (TBP)

The Molecular Landscapes by David S. Goodsell integrate information from structural biology, microscopy and biophysics to simulate detailed views of the molecular structure of living cells.

Illustrations are free for use under a CC-BY-4.0 license

Myelin

Mycoplasma mycoides

Kinetochore

Immunological Synapse

Respiratory Droplet

SARS-CoV-2 Fusion

Biosites: Cytoplasm

Zika Virus

Influenza Virus

Excitatory and Inhibitory Synapses

Insulin Release

HIV-Infected Cell

Caulobacter Polar Microdomain

Biosites: Muscle

Insulin Action

Transfer RNA and Gag Protein

Myoglobin in a Whale Muscle Cell

Casein Micelle and Fat Globule in Milk

RecA and DNA

Collagen and Extracellular Matrix

HIV Vaccine

Escherichia coli

Model of a Mycoplasma Cell

Poliovirus Neutralization

Phage-based COVID-19 Vaccine

Ebola Virus

Abiogenesis

Blood

Coronavirus

Chloroplast

Red Blood Cell Cytoskeleton

Bacteriophage T4 Infection

SARS-CoV-2 and Neutralizing Antibodies

Lipid Droplets

CytoSkeleton

Escherichia coli Bacterium

Biosites: Red Blood Cell

SARS-CoV-2 mRNA Vaccine

Vascular Endothelial Growth Factor (VegF) Signaling

Autophagy

Biosites: Basement Membrane

Cellulose Synthase

Coronavirus Life Cycle

Biosites: Nucleus

HIV in Blood Plasma

JCVI-syn3A Minimal Cell

Measles Virus Proteins

Biosites: Blood Plasma

Influenza Vaccine

Last Universal Common Ancestor