artificial lipase sequence

[Thianchai Lakornrach - SCBT - 3636209]

         1 I would like to know the meaning of an artificial gene.       
           Where is it derive from such as artifitial gene for lipase ?
         
         2 How to get the details of these following sequences? 
               embl A 02815  
               embl A 02816
                    U 17036
               NCBI gi:608524, 608525, 608526
            
Thank you for your help.

THIANCHAI LAKORNRACH
MAHIDOL UNIVERSITY
BANGKOK THAILAND