5398
Erythrocyte delta - aminolevulinic acid dehydratase ( ALAD ) activity , erythrocyte zinc protoporphyrin ( ZPP ) / heme ratio , and urinary coproporphyrin ( UC ) concentration have been employed as biological indicators of moderate - to high - level lead exposure , corresponding to blood levels in excess of 50 micrograms / dl , in human subjects .
 GENE: Erythrocyte delta - aminolevulinic acid dehydratase; GENE: ALAD
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: Erythrocyte delta - aminolevulinic acid dehydratase, ALAD 
Answer:
 GENE: Erythrocyte delta - aminolevulinic acid dehydratase; GENE: ALAD