rating: +16+x
Item#: 6391
Containment Class:
Secondary Class:
Disruption Class:
Risk Class:

Special Containment Procedures: Samples of SCP-6391 are to be kept in Site-125’s high-risk biological containment wing. Organisms and personnel suspected to have come into contact with SCP-6391 are to be quarantined for a period lasting no fewer than 7 days or incinerated as the situation demands. SCP-6391 colonies are to be destroyed using incendiary weapons and their surroundings treated with ionising radiation. Detection of SCP-6391 may be performed by dousing surfaces suspected of being contaminated with unpasteurized milk or blood.


A colony of SCP-6391 created by exposure to a thin film of blood.

Description: SCP-6391 is a class of proteins which are capable of intersecting themselves, enabling them to take on extremely energetically favourable conformations. Furthermore, they are capable of transferring this property to other nearby proteins. In a lab environment, neighbouring instances of SCP-6391 will bind to one another and form striated, fibrous structures. SCP-6391 acts similarly to a prion and will, upon entering an animal’s body, replace their internal organs with a homogenous mass of further instances of SCP-6391, displacing any bodily fluids in the process. Infected animals retain all preexisting faculties but exhibit noticeably different behavioural patterns once the brain has been replaced by a corresponding mass of SCP-6391.

After the complete consumption of all internal organs, the infected animal will enter a dormant state and strands of SCP-6391 will emerge from its body, anchoring the mass to nearby hardpoints before eventually breaking apart the animal’s skin. At this point, the mass becomes a ‘colony’ of SCP-6391, a macroscopic quantity of SCP-6391 which exists outside of a living organism. Infection may occur via physical contact with a colony or through the entry of an infected animal’s tissues into an uninfected individual’s bloodstream or gastrointestinal tract.

Colonies of SCP-6391 are white, sterile and fibrous, resembling spiderwebs. They are correspondingly lightweight and highly durable. Furthermore, SCP-6391 fibres are capable of contracting and expanding, exerting force in a manner similar to animalian muscular tissue.

SCP-6391 documentation is pending review by Dr Sayuri Kataigida in light of recent revelations.

Addendum 6391.1, Exploration Log 6391.2:

Addendum 6391.2, Initial Study and Classification of SCP-6391:

Addendum 6391.3, Exploration Log 6391.3:

Addendum 6391.4, Incident 6391.1:

Addendum 6391.5, Debrief of MTF Epsilon-71, “Tundra Eagles”7 (Abridged):

Addendum 6391.6, Containment of SCP-6391:

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