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.

Induced Lac Repressor

A-DNA

Aspartate Transcarbamoylase (ATCase)

Tomato Bushy Stunt Virus (TBSV)

Deoxyribonucleic Acid (DNA)

Trypsin

Deoxyhemoglobin

Carboxypeptidase A

Lysozyme (512)

DPG-Hemoglobin Complex

Intermolecular Contacts in Hemoglobin S

Lysozyme (488)

Lac Repressor

Hemoglobin (1000)

Hemoglobin

Collagen

Myohemerythrin

Oxyhemoglobin

Cytochrome c (unbound)

Cytochrome c

Myoglobin

Crambin

Transfer Ribonucleic Acid (tRNA)

Myoglobin Fold

DNA

TATA-Binding Protein (TBP)

B-DNA

Z-DNA

Ribonuclease S

Immunoglobulin G (IgG)

Hemoglobin S

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

Mycoplasma mycoides

Myoglobin in a Whale Muscle Cell

Autophagy

Coronavirus Life Cycle

Transfer RNA and Gag Protein

Kinetochore

Immunological Synapse

Influenza Virus

Cellulose Synthase

Insulin Release

Biosites: Red Blood Cell

Vascular Endothelial Growth Factor (VegF) Signaling

HIV in Blood Plasma

Escherichia coli Bacterium

Ebola Virus

Zika Virus

CytoSkeleton

Biosites: Basement Membrane

Casein Micelle and Fat Globule in Milk

HIV-Infected Cell

Biosites: Blood Plasma

Poliovirus Neutralization

Lipid Droplets

Influenza Vaccine

Biosites: Muscle

Biosites: Nucleus

Phage-based COVID-19 Vaccine

Abiogenesis

SARS-CoV-2 Fusion

Escherichia coli

Last Universal Common Ancestor

JCVI-syn3A Minimal Cell

Red Blood Cell Cytoskeleton

SARS-CoV-2 and Neutralizing Antibodies

Excitatory and Inhibitory Synapses

Collagen and Extracellular Matrix

Respiratory Droplet

Myelin

RecA and DNA

Blood

Model of a Mycoplasma Cell

SARS-CoV-2 mRNA Vaccine

Chloroplast

Bacteriophage T4 Infection

HIV Vaccine

Coronavirus

Biosites: Cytoplasm

Measles Virus Proteins

Caulobacter Polar Microdomain

Insulin Action