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.

Carboxypeptidase A

Hemoglobin S

Trypsin

Lac Repressor

DPG-Hemoglobin Complex

Lysozyme (488)

Aspartate Transcarbamoylase (ATCase)

TATA-Binding Protein (TBP)

Ribonuclease S

Cytochrome c

Tomato Bushy Stunt Virus (TBSV)

Crambin

Transfer Ribonucleic Acid (tRNA)

Myohemerythrin

Oxyhemoglobin

Deoxyhemoglobin

Intermolecular Contacts in Hemoglobin S

Cytochrome c (unbound)

Myoglobin Fold

Myoglobin

Hemoglobin (1000)

Lysozyme (512)

Hemoglobin

Induced Lac Repressor

Immunoglobulin G (IgG)

Collagen

A-DNA

B-DNA

Deoxyribonucleic Acid (DNA)

DNA

Z-DNA

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

Phage-based COVID-19 Vaccine

Insulin Release

Chloroplast

JCVI-syn3A Minimal Cell

Model of a Mycoplasma Cell

Influenza Vaccine

SARS-CoV-2 and Neutralizing Antibodies

HIV-Infected Cell

Blood

Coronavirus Life Cycle

Vascular Endothelial Growth Factor (VegF) Signaling

Caulobacter Polar Microdomain

Escherichia coli

Cellulose Synthase

Biosites: Red Blood Cell

Biosites: Muscle

Zika Virus

Myelin

RecA and DNA

Collagen and Extracellular Matrix

Escherichia coli Bacterium

Lipid Droplets

Last Universal Common Ancestor

Red Blood Cell Cytoskeleton

SARS-CoV-2 Fusion

Influenza Virus

Transfer RNA and Gag Protein

Abiogenesis

Casein Micelle and Fat Globule in Milk

Biosites: Cytoplasm

Measles Virus Proteins

Immunological Synapse

Coronavirus

HIV Vaccine

Kinetochore

Respiratory Droplet

Biosites: Blood Plasma

Insulin Action

Bacteriophage T4 Infection

Ebola Virus

HIV in Blood Plasma

SARS-CoV-2 mRNA Vaccine

Biosites: Basement Membrane

Biosites: Nucleus

CytoSkeleton

Autophagy

Myoglobin in a Whale Muscle Cell

Excitatory and Inhibitory Synapses

Mycoplasma mycoides

Poliovirus Neutralization