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.

Z-DNA

Hemoglobin (1000)

Lysozyme (488)

Hemoglobin

Aspartate Transcarbamoylase (ATCase)

Ribonuclease S

Trypsin

A-DNA

Deoxyhemoglobin

Hemoglobin S

Intermolecular Contacts in Hemoglobin S

Tomato Bushy Stunt Virus (TBSV)

Lac Repressor

B-DNA

Myoglobin Fold

Oxyhemoglobin

DPG-Hemoglobin Complex

Transfer Ribonucleic Acid (tRNA)

Cytochrome c

Myohemerythrin

TATA-Binding Protein (TBP)

DNA

Crambin

Immunoglobulin G (IgG)

Collagen

Carboxypeptidase A

Induced Lac Repressor

Myoglobin

Cytochrome c (unbound)

Deoxyribonucleic Acid (DNA)

Lysozyme (512)

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

JCVI-syn3A Minimal Cell

HIV in Blood Plasma

Chloroplast

Escherichia coli

Vascular Endothelial Growth Factor (VegF) Signaling

Lipid Droplets

Insulin Release

Mycoplasma mycoides

Biosites: Cytoplasm

SARS-CoV-2 mRNA Vaccine

Bacteriophage T4 Infection

Blood

Biosites: Nucleus

Biosites: Muscle

Autophagy

Ebola Virus

Zika Virus

RecA and DNA

Transfer RNA and Gag Protein

Respiratory Droplet

Insulin Action

Abiogenesis

Poliovirus Neutralization

CytoSkeleton

Red Blood Cell Cytoskeleton

SARS-CoV-2 and Neutralizing Antibodies

Collagen and Extracellular Matrix

SARS-CoV-2 Fusion

Cellulose Synthase

Biosites: Blood Plasma

Myelin

Immunological Synapse

HIV Vaccine

Phage-based COVID-19 Vaccine

Coronavirus

Influenza Vaccine

Model of a Mycoplasma Cell

Kinetochore

Escherichia coli Bacterium

Coronavirus Life Cycle

Measles Virus Proteins

Biosites: Basement Membrane

Caulobacter Polar Microdomain

Excitatory and Inhibitory Synapses

Last Universal Common Ancestor

Casein Micelle and Fat Globule in Milk

Myoglobin in a Whale Muscle Cell

HIV-Infected Cell

Biosites: Red Blood Cell

Influenza Virus