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.

TATA-Binding Protein (TBP)

Immunoglobulin G (IgG)

Transfer Ribonucleic Acid (tRNA)

Trypsin

DNA

Hemoglobin (1000)

Intermolecular Contacts in Hemoglobin S

Crambin

Cytochrome c

B-DNA

Hemoglobin S

Z-DNA

Lac Repressor

Myoglobin

Ribonuclease S

Deoxyhemoglobin

Cytochrome c (unbound)

Myoglobin Fold

Collagen

Deoxyribonucleic Acid (DNA)

Hemoglobin

A-DNA

Myohemerythrin

Tomato Bushy Stunt Virus (TBSV)

Induced Lac Repressor

Oxyhemoglobin

Lysozyme (512)

Carboxypeptidase A

DPG-Hemoglobin Complex

Lysozyme (488)

Aspartate Transcarbamoylase (ATCase)

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

Biosites: Blood Plasma

Casein Micelle and Fat Globule in Milk

HIV in Blood Plasma

Coronavirus Life Cycle

Poliovirus Neutralization

Excitatory and Inhibitory Synapses

Myelin

Ebola Virus

Biosites: Cytoplasm

Immunological Synapse

SARS-CoV-2 and Neutralizing Antibodies

Biosites: Nucleus

Chloroplast

Biosites: Red Blood Cell

Mycoplasma mycoides

Escherichia coli

HIV-Infected Cell

Bacteriophage T4 Infection

Respiratory Droplet

Influenza Vaccine

JCVI-syn3A Minimal Cell

SARS-CoV-2 Fusion

Model of a Mycoplasma Cell

Biosites: Muscle

Autophagy

Coronavirus

Caulobacter Polar Microdomain

Red Blood Cell Cytoskeleton

Myoglobin in a Whale Muscle Cell

Biosites: Basement Membrane

Influenza Virus

Abiogenesis

Insulin Release

Kinetochore

Last Universal Common Ancestor

Zika Virus

CytoSkeleton

Measles Virus Proteins

Lipid Droplets

Phage-based COVID-19 Vaccine

RecA and DNA

Transfer RNA and Gag Protein

SARS-CoV-2 mRNA Vaccine

Insulin Action

Blood

Cellulose Synthase

HIV Vaccine

Collagen and Extracellular Matrix

Escherichia coli Bacterium

Vascular Endothelial Growth Factor (VegF) Signaling