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.

B-DNA

Myoglobin Fold

Cytochrome c

Tomato Bushy Stunt Virus (TBSV)

Hemoglobin S

Lysozyme (488)

Myoglobin

Ribonuclease S

Carboxypeptidase A

Oxyhemoglobin

Lysozyme (512)

Myohemerythrin

Intermolecular Contacts in Hemoglobin S

Deoxyhemoglobin

Transfer Ribonucleic Acid (tRNA)

Deoxyribonucleic Acid (DNA)

DPG-Hemoglobin Complex

Hemoglobin (1000)

Hemoglobin

Trypsin

Immunoglobulin G (IgG)

Crambin

Cytochrome c (unbound)

Induced Lac Repressor

Collagen

Lac Repressor

DNA

Z-DNA

Aspartate Transcarbamoylase (ATCase)

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

Biosites: Cytoplasm

Mycoplasma mycoides

Myelin

Influenza Virus

Lipid Droplets

Zika Virus

Blood

Insulin Action

RecA and DNA

Biosites: Red Blood Cell

Cellulose Synthase

SARS-CoV-2 Fusion

Abiogenesis

CytoSkeleton

Coronavirus

Chloroplast

Respiratory Droplet

Bacteriophage T4 Infection

JCVI-syn3A Minimal Cell

HIV Vaccine

Escherichia coli

Caulobacter Polar Microdomain

Collagen and Extracellular Matrix

Biosites: Blood Plasma

Influenza Vaccine

Coronavirus Life Cycle

Escherichia coli Bacterium

Ebola Virus

Poliovirus Neutralization

Biosites: Basement Membrane

Transfer RNA and Gag Protein

HIV-Infected Cell

Immunological Synapse

Red Blood Cell Cytoskeleton

Model of a Mycoplasma Cell

Biosites: Muscle

Vascular Endothelial Growth Factor (VegF) Signaling

Excitatory and Inhibitory Synapses

Measles Virus Proteins

Casein Micelle and Fat Globule in Milk

SARS-CoV-2 mRNA Vaccine

Insulin Release

Phage-based COVID-19 Vaccine

Last Universal Common Ancestor

Kinetochore

Biosites: Nucleus

HIV in Blood Plasma

SARS-CoV-2 and Neutralizing Antibodies

Autophagy

Myoglobin in a Whale Muscle Cell