To date, four types of HTLVs (human T-lymphotropic virus 1 [HTLV-I], human T-lymphotropic virus 2 [HTLV-II], HTLV-III, and HTLV-IV) and four types of STLVs (STLV-I, STLV-II, STLV-III, and STLV-V) have been identified. HTLV types HTLV-1 and HTLV-2 viruses are the first retroviruses which were discovered. Both belong to the oncovirus subfamily of retroviruses and can transform human lymphocytes so that they are self-sustaining in vitro.
The goal keeper must wear a jersey distinguishable from his team and the opposing team. This is almost always interpreted to mean he must wear a different color.he goal keeper must wear a jersey distinguishable from his team and the opposing team. This is almost always interpreted to mean he must wear a different color.
If a team does not have a substitute goalkeeper, or they have already used all of their substitutes for the match, an outfield player has to take his place and wear the goalkeeper kit. Goalkeepers can have longer playing careers than outfield players, many not retiring until their late thirties or early forties.f a goalkeeper is hurt or sent off, a substitute goalkeeper has to take their place, otherwise an outfield player must take the ejected keeper's place in goal.