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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.

Immunoglobulin G (IgG)

Collagen

Intermolecular Contacts in Hemoglobin S

Myoglobin Fold

Aspartate Transcarbamoylase (ATCase)

Induced Lac Repressor

Myohemerythrin

Lysozyme (488)

Carboxypeptidase A

Hemoglobin S

Lysozyme (512)

Transfer Ribonucleic Acid (tRNA)

Oxyhemoglobin

Trypsin

B-DNA

Crambin

A-DNA

Cytochrome c

Ribonuclease S

Deoxyhemoglobin

Deoxyribonucleic Acid (DNA)

TATA-Binding Protein (TBP)

Z-DNA

Cytochrome c (unbound)

Hemoglobin (1000)

DPG-Hemoglobin Complex

Lac Repressor

Myoglobin

DNA

Hemoglobin

Tomato Bushy Stunt Virus (TBSV)

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: Cytoplasm

Escherichia coli

Lipid Droplets

RecA and DNA

JCVI-syn3A Minimal Cell

Transfer RNA and Gag Protein

HIV-Infected Cell

Biosites: Muscle

Respiratory Droplet

Influenza Vaccine

Measles Virus Proteins

HIV in Blood Plasma

Zika Virus

Blood

Insulin Action

SARS-CoV-2 and Neutralizing Antibodies

Biosites: Basement Membrane

Immunological Synapse

Chloroplast

Coronavirus

Biosites: Nucleus

Autophagy

Coronavirus Life Cycle

Excitatory and Inhibitory Synapses

Caulobacter Polar Microdomain

SARS-CoV-2 mRNA Vaccine

Last Universal Common Ancestor

Biosites: Blood Plasma

HIV Vaccine

Vascular Endothelial Growth Factor (VegF) Signaling

Red Blood Cell Cytoskeleton

Phage-based COVID-19 Vaccine

Myelin

Insulin Release

Poliovirus Neutralization

Bacteriophage T4 Infection

Abiogenesis

Escherichia coli Bacterium

Influenza Virus

Casein Micelle and Fat Globule in Milk

Mycoplasma mycoides

Biosites: Red Blood Cell

Myoglobin in a Whale Muscle Cell

SARS-CoV-2 Fusion

CytoSkeleton

Ebola Virus

Collagen and Extracellular Matrix

Cellulose Synthase

Model of a Mycoplasma Cell

Kinetochore