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.

Myoglobin Fold

Cytochrome c

Lac Repressor

B-DNA

Myohemerythrin

TATA-Binding Protein (TBP)

Hemoglobin S

DNA

Ribonuclease S

Oxyhemoglobin

A-DNA

Immunoglobulin G (IgG)

Tomato Bushy Stunt Virus (TBSV)

Deoxyhemoglobin

Aspartate Transcarbamoylase (ATCase)

Transfer Ribonucleic Acid (tRNA)

Myoglobin

Trypsin

DPG-Hemoglobin Complex

Induced Lac Repressor

Deoxyribonucleic Acid (DNA)

Lysozyme (512)

Hemoglobin (1000)

Crambin

Carboxypeptidase A

Z-DNA

Intermolecular Contacts in Hemoglobin S

Hemoglobin

Collagen

Cytochrome c (unbound)

Lysozyme (488)

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

Escherichia coli Bacterium

Mycoplasma mycoides

Kinetochore

Collagen and Extracellular Matrix

Autophagy

HIV Vaccine

JCVI-syn3A Minimal Cell

Cellulose Synthase

Insulin Action

Bacteriophage T4 Infection

Measles Virus Proteins

Myoglobin in a Whale Muscle Cell

Phage-based COVID-19 Vaccine

SARS-CoV-2 mRNA Vaccine

HIV-Infected Cell

Coronavirus Life Cycle

Zika Virus

Biosites: Cytoplasm

Influenza Vaccine

Respiratory Droplet

RecA and DNA

Casein Micelle and Fat Globule in Milk

Biosites: Muscle

Ebola Virus

Lipid Droplets

SARS-CoV-2 and Neutralizing Antibodies

Biosites: Nucleus

Poliovirus Neutralization

SARS-CoV-2 Fusion

Caulobacter Polar Microdomain

Blood

Escherichia coli

Chloroplast

Model of a Mycoplasma Cell

Abiogenesis

Biosites: Blood Plasma

Excitatory and Inhibitory Synapses

Insulin Release

Immunological Synapse

Coronavirus

HIV in Blood Plasma

Last Universal Common Ancestor

Transfer RNA and Gag Protein

Influenza Virus

Biosites: Basement Membrane

Red Blood Cell Cytoskeleton

Biosites: Red Blood Cell

Myelin

Vascular Endothelial Growth Factor (VegF) Signaling

CytoSkeleton