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.

Collagen

Myohemerythrin

Cytochrome c (unbound)

A-DNA

Deoxyhemoglobin

Transfer Ribonucleic Acid (tRNA)

Lac Repressor

Hemoglobin (1000)

DPG-Hemoglobin Complex

Carboxypeptidase A

Trypsin

Induced Lac Repressor

TATA-Binding Protein (TBP)

Myoglobin Fold

Z-DNA

B-DNA

Myoglobin

DNA

Hemoglobin

Aspartate Transcarbamoylase (ATCase)

Lysozyme (512)

Tomato Bushy Stunt Virus (TBSV)

Deoxyribonucleic Acid (DNA)

Crambin

Ribonuclease S

Intermolecular Contacts in Hemoglobin S

Cytochrome c

Immunoglobulin G (IgG)

Oxyhemoglobin

Hemoglobin S

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

Immunological Synapse

Biosites: Cytoplasm

Biosites: Nucleus

Respiratory Droplet

Bacteriophage T4 Infection

Coronavirus

Transfer RNA and Gag Protein

Phage-based COVID-19 Vaccine

Abiogenesis

Excitatory and Inhibitory Synapses

HIV Vaccine

CytoSkeleton

Model of a Mycoplasma Cell

Biosites: Red Blood Cell

Biosites: Blood Plasma

Poliovirus Neutralization

Coronavirus Life Cycle

Insulin Release

JCVI-syn3A Minimal Cell

Biosites: Muscle

Autophagy

Chloroplast

Myoglobin in a Whale Muscle Cell

Blood

Zika Virus

Ebola Virus

HIV in Blood Plasma

SARS-CoV-2 Fusion

Kinetochore

RecA and DNA

SARS-CoV-2 and Neutralizing Antibodies

Insulin Action

Last Universal Common Ancestor

Collagen and Extracellular Matrix

HIV-Infected Cell

Cellulose Synthase

Influenza Vaccine

Caulobacter Polar Microdomain

Biosites: Basement Membrane

Lipid Droplets

Escherichia coli Bacterium

Mycoplasma mycoides

Escherichia coli

Red Blood Cell Cytoskeleton

Measles Virus Proteins

Influenza Virus

Myelin

Vascular Endothelial Growth Factor (VegF) Signaling

Casein Micelle and Fat Globule in Milk

SARS-CoV-2 mRNA Vaccine