See Your Spot-Tag With Ease

Made for immunofluorescence and Western analyses

Spot-Labels are very small, highly specific anti-Spot-Tag binding proteins covalently coupled to bright and stable fluorescent dyes. These anti-Spot binding proteins are derived from a single-domain alpaca antibody fragment (just 14kDa) called a Nanobody. Conventional protocols for labeling with antibodies usually require a sandwich technique, in which the primary antibody binds the target molecule and a “labeled”-secondary antibody is added later to visualize the location of this molecule (whether on a blot or on a slide). These multi-step protocols are long, suffer from unwanted background, and can result in non-specific targeting and low signal. By comparison, Spot-Labels are much smaller, yielding binding kinetics that are stronger and more precise.


The recombinantly expressed single-binding domain Spot-Label (monovalent) is optimized for use with Western blots. The bivalent form of Spot-label offers incredible performance in standard immunofluorescence (IF) microscopy. The reason? These tiny fluorescent labels can penetrate much more easily, and bind more effectively, than traditional monoclonal antibodies that are over 10 times its size. The Spot-Label/Spot-Tag system is the first peptide-tag/Nanobody system applied in Super Resolution Microscopy. Due to their small size, Nanobodies are particularly suitable for effective labelling with minimal fluorophore displacement for super-resolution microscopy. For relative comparison of the sizes of both affinity reagents, see the schematics to visualize why size matters.


User Manual - ATTO594 for IF
User Manual - ATTO488 for  Western blot
User Manual - Unconjugated  for Western blot & IP
Spot-Tag Cloning Vectors
Spot-Trap Affinity Reagents
Nanobody-Trap Reagents
Live Cell Imaging Systems



Spot-label size comparison       Spot-Label Benefits





Purified recombinant protein in PBS



Preservative: 0.09% sodium azide

Part Numbers

eba59410, eba59450, ema48810, ema48850, etx250


Shipped at ambient temperature. Upon receipt store at 4°C. Do not freeze.

Spot-Label for Immunofluorescence (IF)

ORDERING - Spot-Label for Immunofluorescence (IF)