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.

Myohemerythrin

Myoglobin Fold

Cytochrome c

Myoglobin

Cytochrome c (unbound)

TATA-Binding Protein (TBP)

Tomato Bushy Stunt Virus (TBSV)

Hemoglobin (1000)

DPG-Hemoglobin Complex

Carboxypeptidase A

Aspartate Transcarbamoylase (ATCase)

Immunoglobulin G (IgG)

Crambin

Hemoglobin S

Transfer Ribonucleic Acid (tRNA)

Deoxyhemoglobin

Oxyhemoglobin

Deoxyribonucleic Acid (DNA)

Lysozyme (488)

Lysozyme (512)

A-DNA

B-DNA

Collagen

Trypsin

Lac Repressor

Hemoglobin

Intermolecular Contacts in Hemoglobin S

Induced Lac Repressor

DNA

Ribonuclease S

Z-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

Bacteriophage T4 Infection

Biosites: Cytoplasm

Insulin Action

Poliovirus Neutralization

Excitatory and Inhibitory Synapses

Influenza Virus

JCVI-syn3A Minimal Cell

Zika Virus

HIV-Infected Cell

Last Universal Common Ancestor

Immunological Synapse

Escherichia coli

HIV Vaccine

SARS-CoV-2 mRNA Vaccine

Biosites: Red Blood Cell

Measles Virus Proteins

Influenza Vaccine

RecA and DNA

Cellulose Synthase

Biosites: Nucleus

Transfer RNA and Gag Protein

Escherichia coli Bacterium

Casein Micelle and Fat Globule in Milk

Chloroplast

Respiratory Droplet

SARS-CoV-2 Fusion

Mycoplasma mycoides

Lipid Droplets

Blood

Biosites: Blood Plasma

Autophagy

Caulobacter Polar Microdomain

Biosites: Muscle

Myoglobin in a Whale Muscle Cell

Coronavirus

Coronavirus Life Cycle

SARS-CoV-2 and Neutralizing Antibodies

CytoSkeleton

Model of a Mycoplasma Cell

Vascular Endothelial Growth Factor (VegF) Signaling

Ebola Virus

Phage-based COVID-19 Vaccine

Collagen and Extracellular Matrix

HIV in Blood Plasma

Kinetochore

Myelin

Insulin Release

Abiogenesis

Biosites: Basement Membrane

Red Blood Cell Cytoskeleton