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

Hemoglobin (1000)

B-DNA

Ribonuclease S

Oxyhemoglobin

Induced Lac Repressor

Cytochrome c

Tomato Bushy Stunt Virus (TBSV)

Lac Repressor

Lysozyme (488)

Crambin

DPG-Hemoglobin Complex

Hemoglobin S

Deoxyhemoglobin

Transfer Ribonucleic Acid (tRNA)

Trypsin

Carboxypeptidase A

TATA-Binding Protein (TBP)

Intermolecular Contacts in Hemoglobin S

Immunoglobulin G (IgG)

Myohemerythrin

Aspartate Transcarbamoylase (ATCase)

Myoglobin Fold

DNA

Cytochrome c (unbound)

Lysozyme (512)

Deoxyribonucleic Acid (DNA)

Z-DNA

Hemoglobin

A-DNA

Collagen

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

Myelin

Coronavirus Life Cycle

Insulin Release

SARS-CoV-2 mRNA Vaccine

SARS-CoV-2 Fusion

Biosites: Red Blood Cell

Abiogenesis

Casein Micelle and Fat Globule in Milk

Blood

Caulobacter Polar Microdomain

Vascular Endothelial Growth Factor (VegF) Signaling

Measles Virus Proteins

Myoglobin in a Whale Muscle Cell

Poliovirus Neutralization

Biosites: Blood Plasma

HIV Vaccine

HIV-Infected Cell

Collagen and Extracellular Matrix

Biosites: Muscle

Phage-based COVID-19 Vaccine

CytoSkeleton

HIV in Blood Plasma

Influenza Vaccine

Escherichia coli Bacterium

Excitatory and Inhibitory Synapses

Red Blood Cell Cytoskeleton

Kinetochore

Transfer RNA and Gag Protein

Escherichia coli

Insulin Action

Immunological Synapse

Lipid Droplets

Chloroplast

Coronavirus

Biosites: Cytoplasm

Last Universal Common Ancestor

Cellulose Synthase

Biosites: Nucleus

Model of a Mycoplasma Cell

Biosites: Basement Membrane

Ebola Virus

Respiratory Droplet

JCVI-syn3A Minimal Cell

RecA and DNA

Zika Virus

Mycoplasma mycoides

Autophagy

Influenza Virus

Bacteriophage T4 Infection

SARS-CoV-2 and Neutralizing Antibodies