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Molecule of the Month
January 2026

Natural RNA-Only Assemblies

Large and intricate naturally occurring structures composed exclusively of RNA

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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

Z-DNA

Transfer Ribonucleic Acid (tRNA)

Deoxyribonucleic Acid (DNA)

Cytochrome c

Ribonuclease S

Intermolecular Contacts in Hemoglobin S

Myoglobin

TATA-Binding Protein (TBP)

Lac Repressor

Cytochrome c (unbound)

Hemoglobin

Tomato Bushy Stunt Virus (TBSV)

DPG-Hemoglobin Complex

Crambin

Lysozyme (512)

Trypsin

Immunoglobulin G (IgG)

Hemoglobin (1000)

Myohemerythrin

Aspartate Transcarbamoylase (ATCase)

Deoxyhemoglobin

Collagen

A-DNA

B-DNA

Carboxypeptidase A

Induced Lac Repressor

Hemoglobin S

Lysozyme (488)

DNA

Oxyhemoglobin

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

Bacteriophage T4 Infection

Coronavirus

Kinetochore

Respiratory Droplet

Transfer RNA and Gag Protein

Phage-based COVID-19 Vaccine

Autophagy

SARS-CoV-2 mRNA Vaccine

Biosites: Basement Membrane

Casein Micelle and Fat Globule in Milk

HIV Vaccine

CytoSkeleton

Blood

HIV-Infected Cell

Coronavirus Life Cycle

RecA and DNA

Biosites: Muscle

Last Universal Common Ancestor

Biosites: Cytoplasm

Myoglobin in a Whale Muscle Cell

Lipid Droplets

Escherichia coli

Biosites: Nucleus

Measles Virus Proteins

SARS-CoV-2 Fusion

SARS-CoV-2 and Neutralizing Antibodies

Vascular Endothelial Growth Factor (VegF) Signaling

Poliovirus Neutralization

Chloroplast

Insulin Action

Escherichia coli Bacterium

Model of a Mycoplasma Cell

Mycoplasma mycoides

Cellulose Synthase

Influenza Virus

Excitatory and Inhibitory Synapses

Red Blood Cell Cytoskeleton

HIV in Blood Plasma

Biosites: Blood Plasma

Influenza Vaccine

Biosites: Red Blood Cell

Myelin

Zika Virus

JCVI-syn3A Minimal Cell

Abiogenesis

Collagen and Extracellular Matrix

Immunological Synapse

Insulin Release

Ebola Virus

Caulobacter Polar Microdomain