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.

Induced Lac Repressor

Ribonuclease S

Hemoglobin (1000)

Lac Repressor

Lysozyme (488)

Hemoglobin S

DPG-Hemoglobin Complex

Cytochrome c

A-DNA

Oxyhemoglobin

Transfer Ribonucleic Acid (tRNA)

Deoxyhemoglobin

Crambin

Trypsin

Tomato Bushy Stunt Virus (TBSV)

TATA-Binding Protein (TBP)

Hemoglobin

Immunoglobulin G (IgG)

Lysozyme (512)

B-DNA

DNA

Carboxypeptidase A

Collagen

Myohemerythrin

Myoglobin

Deoxyribonucleic Acid (DNA)

Myoglobin Fold

Cytochrome c (unbound)

Z-DNA

Intermolecular Contacts in Hemoglobin S

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

Immunological Synapse

Influenza Virus

Mycoplasma mycoides

Influenza Vaccine

Blood

Myoglobin in a Whale Muscle Cell

JCVI-syn3A Minimal Cell

SARS-CoV-2 mRNA Vaccine

Insulin Action

Escherichia coli Bacterium

Transfer RNA and Gag Protein

Red Blood Cell Cytoskeleton

Chloroplast

Measles Virus Proteins

Escherichia coli

SARS-CoV-2 Fusion

Biosites: Muscle

Respiratory Droplet

Biosites: Red Blood Cell

Coronavirus Life Cycle

Myelin

Zika Virus

HIV-Infected Cell

Phage-based COVID-19 Vaccine

Biosites: Nucleus

Biosites: Blood Plasma

Collagen and Extracellular Matrix

CytoSkeleton

Casein Micelle and Fat Globule in Milk

Autophagy

Model of a Mycoplasma Cell

Poliovirus Neutralization

RecA and DNA

Vascular Endothelial Growth Factor (VegF) Signaling

Abiogenesis

Excitatory and Inhibitory Synapses

Last Universal Common Ancestor

Caulobacter Polar Microdomain

HIV in Blood Plasma

Lipid Droplets

Biosites: Cytoplasm

HIV Vaccine

Cellulose Synthase

SARS-CoV-2 and Neutralizing Antibodies

Bacteriophage T4 Infection

Biosites: Basement Membrane

Insulin Release

Kinetochore

Coronavirus

Ebola Virus