Sterigmatocystin
Aflatoxin B1

Sterigmatocystin is enzymatically
converted into  Aflatoxin B1,
both are bisfuranomethoxybenzenes
from Singh R., Appl. and Environ. Microbiol. 1976 (31) 743

Sterigmatocystin can be found in food*, concentrations reaching up to:
corn: 20 microg/Kg
wheat: 300 microg/Kg
gouda: 600 microg/Kg
rice: 16 300 microg/Kg
coffee beans: 12 000 microg/Kg
For IARC, International  Agency for Research on Cancer, Sterigmatocystin is a group 2B carcinogen, Aflatoxin is in group 1
OTHER POLLUTIONS
Sterigmatocystin, in rodents, is synergistic with DON (IARC Group 3) for production of lung adenocarcinoma.
Roridin E
Ochratoxin A
Aflatoxin B2
Chaetoglobosin A
Sterigmatocystin
Roquefortine C
Aflatoxin B1

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From water-damaged buildings
Adapted from: Polizzi V., Delmulle B., Adams A. Moretti A., Susca A., Picco AM., Rosseel Y., Kindt R., Van Bocxlaer J., De Kimpe N., Van Peteghem C., and Sarah de Saeger , J. Environ. Monitoring. 2009, 11:1849
Numbers of samples from houses positive for the named mycotoxin
In New Orleans; after Katrina, levels of Sterigmatocystin in dust of some houses was 16 to 28 microg/Kg  of dust. Bloom E. et al.; Indoor Air, 2009;19:153
* Versilovskis A. and De Saeger S. Mol. Nutr. Food Res. 2010,54:136
1/Sterigmatocystin key mycotoxin after water damage, is also present in food
3/Sterigmatocystin also induces bronchio-alveolar damage
BAS bronchiolar space, with cellular or mucous-like debris ,
AW alveolar wall : edematous
AS alveolar space : with swollen macrophages
Reproduced from J.D. Miller, M; Sun, A. Gilyan, J. Roy, T.G. Rand; Inflammation-associated gene transcription and expression in mouse lungs induced by low-molecular weight compounds from fungi from the built environment.
Chemico-biological interactions, 2010,  (183):113 - 124
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STERIGMATOCYSTIN
The main producer of Sterigmatocystin is Aspergillus versicolor.(see review by Versilovskis A. & De Saeger S.), Penicillium can also be a producer.
4/Source
2/Sterigmatocystin is a carcinogen