Glossary entry (derived from question below)
English term
Portugal
Translating is my life
Native in: Portuguese (Variant: European/Portugal) 
Works in: Spanish to Portuguese, English to Portuguese, French to Portuguese, and 6 more.
Symport
| 4 +4 | simporte |
Maria Teresa Borges de Almeida
|
| 4 | symport |
Dr Manuel Delgado
|
| 4 | simportador |
Catarina Ribas
|
| 4 | cotransporte |
Matheus Chaud
|
Proposed translations
Portugal
Maria Teresa Borges de Almeida 
30+ years translating EU documents
Native in: Portuguese (Variant: European/Portugal)
Works in: English to Portuguese, French to Portuguese, Spanish to Portuguese, and 1 more.
simporte
symport=simporte; transporte acoplado de duas moléculas ou íons diferentes através de uma membrana na mesma direção por um mecanismo carreador comum.
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Note added at 25 mins (2016-12-26 15:40:25 GMT)
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A resposta imune pode ser dirigida contra um ou mais antigénio
s das células foliculares – TPO, Tg, receptor da TSH, simportador do iodo (simportador Na+/I+ [NIS]) e megalina – ou hormonas tiroideias, podendo, neste caso, interferir com a sua dosagem.
https://estudogeral.sib.uc.pt/bitstream/10316/26160/3/Trabal...
Brazil
Medical & Pharma translation since 1973
Native in: Portuguese (Variants: Brazilian, European/Portugal)
Works in: English to Portuguese, French to Portuguese
Brazil
B.A. in Linguistics/B.Sc. in Nutrition
Native in: Portuguese
Works in: English to Portuguese
simportador
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Note added at 36 minutos (2016-12-26 15:51:19 GMT)
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Na verdade "simportador" seria o "symporter". Concordo com a Teresa Borges que "symport" seria melhor traduzido como "simporte".
Brazil
IT Specialist • M.A. in Linguistics
Native in: Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Spanish to Portuguese, Portuguese to English, and 1 more.
cotransporte
www.slideshare.net/naiellyrodrigues/biologia-celular-117103...
...esse mecanismo é denominado co-transporte (symport)
http://www.odiamax.com/download/Mqpi9uK2Mqs/TRANSPORTE A TRA...
Transporte activo secundário:
cotransporte (simporte)
contratransporte (antiporte)
Em espanhol:
Glosario-vocabulario bioquímica biología molecular
www.biorom.uma.es/contenido/Glosario/S.html
symport = cotransporte unidireccional
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