Friends of Mr Mayes, an analyst for the Healthcare Commission, took photographs of him to the Royal London Hospital in Whitechapel in a bid to track him down. He is believed to have travelled through King's Cross station on the Piccadilly line on his way to a seminar.
Elizabeth Daplyn 26, MANAGER
Ms Daplyn, who lives in Highgate, north London, has not been seen since setting off for work on Thursday in the neuroradiology department of University College Hospital. She was travelling on the Piccadilly line to Russell Square.
Lee Baisden 34, ACCOUNTANT
An accountant for the London Fire Brigade, Mr Baisden has not been seen since leaving his home in Romford for work. Friends believe he was on the Circle line when the Aldgate bomb went off.
Marie Hartley 34, FROM LANCASHIRE
Mrs Hartley, from Oswaldtwistle, who was travelling on the No 30 bus, was on her way to visit an exhibition. Mrs Hartley, who has two children, was with a friend, Camille Scott, on the top deck of the bus. Ms Scott is in hospital in a serious condition. Mrs Hartley's uncle Ian McMinn said: "If there was any chance she could have contacted home she would have done. Hopefully she is in hospital unable to get to a phone to let us know she is safe."
Helen Jones 28, ACCOUNTANT
Friends of Ms Jones, from Holloway, north London, fear she may have been caught up in the carnage as she travelled on the Piccadilly line to her office in central London. She has not been in contact with her family in the Scottish Borders since Thursday.
Shyanuja Sangary ROYAL MAIL WORKER, 30
Ms Sangary has not been seen since leaving home in Kensal Rise, north-west London, on Thursday to go to work at Royal Mail offices near Old Street. Her family believe she may have been on board the No 30 bus.
Ojara Ikeagwu 55, SOCIAL WORKER
Mrs Ikeagwu, who has three children, is believed to have caught a Piccadilly line train from King's Cross on the way from her home in Luton to her workplace in Hounslow.
Giles Hart 55, ENGINEER
Mr Hart, a father of two, from Hornchurch, Essex, was travelling to Angel, Islington, where he worked as an engineer for British Telecom. His family believe he may have been in the Aldgate area when the bombs exploded and have issued an appeal for information.
James Adams 32
Friends say he spoke to his mother in Peterborough when he phoned to tell her had arrived at King's Cross. Nothing further has been heard.
Fiona Stevenson SOLICITOR, 29
Ms Stevenson, from Danbury, Essex, failed to arrive at work at her office in central London.
Christian 'Njoya' Small 28, SALESMAN
Friends of Mr Small, from Walthamstow, north-east London, have heard nothing from him since he left for his advertising job on Thursday morning. His route would have involved changing to the Piccadilly line either at Finsbury Park or King's Cross.
Gladys Wundowa CLEANER, 51
Ms Wundowa, from Chadwell Heath, Essex, who has two children, has not been in touch with her family since the bombs; she was heading to Shoreditch for a college course after finishing her cleaning shift at University College London, near Euston. Her husband, Emmanual, 53, a security guard, said he was "beside himself with worry".
Emily Jenkins 24
Believed to have been travelling on the Piccadilly line to Russell Square on her way to work. Her family have reported her as missing. Ms Jenkins, from Richmond, south-west London, was wearing black trousers and a blue top with open-toed sandals. She always has four rings on her fingers and thumb and has a tattoo at the base of her spine and scars on her neck and wrist.
Also missing... The family of STAN BREWSTER, 52, from Derby, who has two children, fear he was caught in the blasts. His brother-in-law Dave Wall said: "There is nothing we can do but wait. We've rung all the hospitals twice. We have spoken to the police but there's nothing they can tell us."
SUSAN LEVY, 50, from Hertfordshire, who has one child, is believed to have been travelling on the Piccadilly line.
The mother of CARRIE TAYLOR, 24, last saw her at Liverpool Street station as they travelled together from their home in Billericay, Essex. June Taylor said: "We have a little farewell ritual. Carrie gives me a kiss goodbye." Her daughter would have been travelling on the Circle line at Aldgate on her way to her job at the Royal Society of Arts on the Embankment.
ADRIAN JOHNSON, from Newark, Nottinghamshire, last spoke to his wife at 8am on Thursday as he arrived at King's Cross. He was due to travel on the Piccadilly line to his office near Haymarket.
Other names of people listed as missing: