Molecule of the Month
April 2026

Insect Odorant Receptors

Protein complexes that allow insects to detect a wide variety of volatile compounds

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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)

Hemoglobin

Collagen

Carboxypeptidase A

Induced Lac Repressor

Ribonuclease S

Hemoglobin (1000)

B-DNA

Tomato Bushy Stunt Virus (TBSV)

Lysozyme (488)

Deoxyribonucleic Acid (DNA)

Intermolecular Contacts in Hemoglobin S

Oxyhemoglobin

TATA-Binding Protein (TBP)

Cytochrome c (unbound)

Myoglobin Fold

Lysozyme (512)

A-DNA

Trypsin

DNA

Aspartate Transcarbamoylase (ATCase)

Lac Repressor

Myohemerythrin

Myoglobin

Deoxyhemoglobin

Crambin

Hemoglobin S

DPG-Hemoglobin Complex

Transfer Ribonucleic Acid (tRNA)

Z-DNA

Cytochrome c

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

Excitatory and Inhibitory Synapses

Respiratory Droplet

CytoSkeleton

Bacteriophage T4 Infection

Insulin Action

Blood

Zika Virus

Measles Virus Proteins

Influenza Virus

Insulin Release

Last Universal Common Ancestor

Influenza Vaccine

Abiogenesis

Coronavirus

Biosites: Red Blood Cell

JCVI-syn3A Minimal Cell

Vascular Endothelial Growth Factor (VegF) Signaling

Poliovirus Neutralization

SARS-CoV-2 mRNA Vaccine

SARS-CoV-2 Fusion

Biosites: Blood Plasma

Collagen and Extracellular Matrix

Transfer RNA and Gag Protein

Mycoplasma mycoides

Kinetochore

Biosites: Nucleus

HIV in Blood Plasma

Lipid Droplets

Biosites: Basement Membrane

Autophagy

HIV-Infected Cell

Myoglobin in a Whale Muscle Cell

Chloroplast

Casein Micelle and Fat Globule in Milk

RecA and DNA

Biosites: Cytoplasm

Phage-based COVID-19 Vaccine

Caulobacter Polar Microdomain

Escherichia coli

Myelin

Biosites: Muscle

Immunological Synapse

Model of a Mycoplasma Cell

Escherichia coli Bacterium

Coronavirus Life Cycle

Cellulose Synthase

Red Blood Cell Cytoskeleton

Ebola Virus

SARS-CoV-2 and Neutralizing Antibodies

HIV Vaccine