Option to secretion.

--------------------------------------------------
Note added at 16 mins (2014-12-25 16:36:43 GMT)
--------------------------------------------------

Intra- and extra-cellular excretion of carboxylates
As we discuss here, recent research has demonstrated the functional importance of carboxylate excretion into the soil, apoplast and vacuole, particular with respect to the regulation of stomatal and root function.
http://www.ncbi.nlm.nih.gov/pubmed/19913451
ccccccccccccccccccccccccccccccccc

Investigation of the relation between extracellular excretion of glycollate and the photosynthetic CO2-uptake in the blue-green alga Anacystis nidulans
http://www.ncbi.nlm.nih.gov/pubmed/24493459
ccccccccccccccccccccccccccccccccccccc

Extracellular excretion of the surface active organic matter during a
http://fulir.irb.hr/1157/

--------------------------------------------------
Note added at 20 mins (2014-12-25 16:40:04 GMT)
--------------------------------------------------

cccccccccc

Excretion is the process by which waste products of metabolism and other non-useful materials are eliminated from an organism. In vertebrates this is primarily carried out by the lungs, kidneys and skin
http://en.wikipedia.org/wiki/Excretion

--------------------------------------------------
Note added at 43 mins (2014-12-25 17:03:51 GMT)
--------------------------------------------------

cccccccccccccccccc

.. some bacteria, excrete chemical substances that are toxic to specific bacteria.
http://en.wikibooks.org/wiki/NCEA_Level_1_Science/Life_proce...
ccccccccccccccccccccccccccccccccccccccc

or the bacteria may excrete the methylmercury to the water
http://www.usgs.gov/themes/factsheet/146-00/

ccccccccccccc

which are classified into two groups: exotoxins (toxins excreted by microorganisms into
https://books.google.com/books?id=xteiARU46SQC&pg=PA470&lpg=...
ccccccccccccccccccccc

Microbes excrete mycotoxins and mycotoxins (waste products) from
http://www.cancertutor.com/alzheimers/