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

Cytochrome c

Myohemerythrin

B-DNA

Hemoglobin (1000)

Oxyhemoglobin

Hemoglobin S

Ribonuclease S

Aspartate Transcarbamoylase (ATCase)

Deoxyhemoglobin

Crambin

Lysozyme (512)

Z-DNA

Tomato Bushy Stunt Virus (TBSV)

Immunoglobulin G (IgG)

Hemoglobin

Lysozyme (488)

Transfer Ribonucleic Acid (tRNA)

Induced Lac Repressor

Deoxyribonucleic Acid (DNA)

Myoglobin Fold

DPG-Hemoglobin Complex

Lac Repressor

Cytochrome c (unbound)

Collagen

A-DNA

Trypsin

TATA-Binding Protein (TBP)

Intermolecular Contacts in Hemoglobin S

Carboxypeptidase A

DNA

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

Influenza Virus

Coronavirus

Transfer RNA and Gag Protein

Measles Virus Proteins

Cellulose Synthase

Biosites: Basement Membrane

Biosites: Cytoplasm

Collagen and Extracellular Matrix

Myoglobin in a Whale Muscle Cell

Abiogenesis

SARS-CoV-2 Fusion

Coronavirus Life Cycle

Immunological Synapse

Poliovirus Neutralization

Excitatory and Inhibitory Synapses

HIV in Blood Plasma

Autophagy

Biosites: Red Blood Cell

Model of a Mycoplasma Cell

Lipid Droplets

Insulin Release

Caulobacter Polar Microdomain

Myelin

HIV-Infected Cell

Bacteriophage T4 Infection

Blood

Biosites: Blood Plasma

Ebola Virus

Respiratory Droplet

Biosites: Muscle

Biosites: Nucleus

Vascular Endothelial Growth Factor (VegF) Signaling

Escherichia coli Bacterium

Chloroplast

SARS-CoV-2 and Neutralizing Antibodies

Kinetochore

RecA and DNA

Insulin Action

Casein Micelle and Fat Globule in Milk

Last Universal Common Ancestor

Escherichia coli

Zika Virus

HIV Vaccine

JCVI-syn3A Minimal Cell

Phage-based COVID-19 Vaccine

Red Blood Cell Cytoskeleton

Mycoplasma mycoides

Influenza Vaccine

SARS-CoV-2 mRNA Vaccine

CytoSkeleton